Mat Plus No.17-20: Solutions to Originals

396. Vyacheslav Kamenskiy
1.Be2! (~)
1... Kh3 2.Rh6#
1... Kh5 2.Kg3#
Gligor Denkovski immediatelly informed us about a very similar problem of his:
5B15K5k14R9R






#2 4+1
 
Gligor Denkovski

Studentski zbor 6.3.1967

1.Bg7! (~)
1... Kd4 2.Ke6#
1... Kd6 2.Rd2#


397. Victor Kolpakov
a) 1.Se2! (~)
1... Kd1 2.Qc1#
1... Kf1 2.Qg1#
1... Kd2 2.Qc1#
(1.Qc3+ Kd1 2.Be2#, 1... Kf2!)
b) 1.Sf1! (~)
1... Kd1 2.Qb1#
1... Kf2 2.Qg3#


398. Vyacheslav Kamenskiy
1.Bf1! (~)
1... Kc4 2.Ke3#
1... Ke4 2.Qd3#
1... a4 2.Qb4#


399. Vyacheslav Kamenskiy
1.Bb4! (~)
1... Ke1: 2.Ra1#
1... de1Q 2.Bg2#
1... de1S 2.Rf2#
1... d1Q 2.Rf2#
1... d1S 2.Bg2#
Reciprocal mates after Pd2 promotions.[A].


400. M. Lipton & J. Rice
1.Rf4? ~ 2.cb7#, 1... Sce4!
1... Sfd5/Sfe4 2.Rf8#
1... Scd5 2.Ra4#
1.Rf5? ~ 2.Ra5/cb7#
1... Sfd5 2.Rf8#
1... Scd5!
1.Re3? ~ 2.cb7#, 1... Sfe4!
1... Scd5/Sce4 2.Ra3:#
1... Sfd5 2.Re8#
1.Rd3? ~ 2.Rd8/cb7#, 1... Sfd5!
1... Scd5 2.Ra3:#
1.Rg3! ~ 2.cb7#
1... Scd5/Sce4 2.Ra3:#
1... Sfd5/Sfe4 2.Rg8#
1... bc6 2.Bc6:#
White's four tries are defeated by a Nowotny-style interference on one of the cutting points d5 and e4. The key ensures that no double line-cutting is possible. We were pleased to discover the cook-stopping device with BBa1 and WKh8, and to get the idea to work in Meredith.[A]


401. Srecko Radovic
1.Qf6? ~ 2.Qe6#
1... Rh5 2.Qf3#
1... Bf4 2.Qf4:#
1... g5!
1.Qa4? ~ 2.Qd7#
1... Bf8:!
1.Qd4! ~ 2.Qd7#
1... g5 2.Sg3# (2.Sf6?)
1... Bf8: 2.Sd2# (2.Sg5?)
1... Rg3 2.Sf2#
1... Rf3 2.Sf6#
1... Rh5 2.Sg5#
1... Bg5 2.Rg5:#
1... Bf4 2.Rf4:#
Variation 1... Bf8 2.Sd2 makes the difference from the famous Botacchi mechanism, and the refutation for 1.Qa4? try. Here we see two interesting paits of mates, with Sf6 and Sg5 as effective and non-effective mates.[MK] ... as a matter of fact, there is no dual-avoidance after 1... Bf8 at all![MV]
A. Bottacchi
1.pr Alfiere di Re 1921
bb8ppR10K1s5R3k1S2s1r3SQ1P11B






#2 8+8
1.Qh4! ~ 2.Qf6#
1... d5 2.Sd3#
1... Rc5 2.Sd5#
1... Rc6+ 2.Sg6#
1... Rd3 2.Sfe2#
1... Re3 2.Se6#
1... Sc4 2.Sge2#
1... c5 2.Sf5#
1... c6 2.Re4#
1... Bd5 2.Rd5:#
1... Be4 2.Re4:#

402. Milan Velimirovic
1... Qf5: 2.Qe7#
(1... Qd4: 2.f6/Qe7#)
1.Kf2! ~ 2.Sc3/Sf6:#
1... Qd4:+ 2.Se3#
1... Qf5:+ 2.Sf4#
1... Qd6 2.f6#
1... Qe5 2.de5#
1... d2 2.Qb1#
Check-provocing key, one pair of cross-checks with pin mates and another with P-battery mates. Can this survive a test for an anticipation?![A]


403. Darko Saljic
1... Sf5 2.Bd5#
1... dc2 2.Qg8#
1.e5! ~ 2.Sd4#
1... Sf5 2.Qg8#
1... dc2 2.Bd5#
1... Bf6+,Be5: 2.Qf6:,Sc5#


404. Alexander Zidek
1.Qd6? ~ 2.Qe5:#, 1... ed4!
1.Qc6? ~ 2.Qf3#, 1... Sd7:+!
1.Bb5? (~), 1... d2!
1.Rd6? ~ 2.Rf6#, 1... Sd7+ 2.Bd7:#, 1... Se6+!
1.de5? ~ 2.Qf6#, 1... Ke5: 2.Rd5#, 1... Sd7:+!
1.Kc4? (~), 1... d2!
1.Kb4! (~)
1... e5~ 2.Rd5#
1... Sf~ 2.Qe6#
1... Sf7: 2.Rf7:#
1... d2 2.Qf1#
Wechselseitige Turm/Dame- sowie Dame/Laufer-Verstellungen sowie veitere Verfuhrungen.[A]


405. Marjan Kovacevic
1... R~ 2.Sef3/Sf7#
1... B~ 2.Sg4/Sd7#
1.Sg2! ~ 2.Qh4#
1... Rc7 2.Sf3#
1... Rc2 2.Sf7#
1... Bf7 2.Sg4#
1... Be8+ 2.Sd7#
1... Kg5,Bf5:,Sf7 2.Qh4,Qf5:,Rg6:#
Two pairs of dual-avoidance variations with all mates from the same S-battery.[A]


406. Y. Marker & A. Pankratyev
1.b4? ~ 2.Rc5#
1... Bc2 2.Qe6#
1... Be4!
1.Ke3? ~ 2.Rd4#
1... Be4 2.Qe6#
1... Bc2!
1.Se6! ~ 2.Sc7#
1... Be4 2.Rc5#
1... Bc2 2.Rd4#
1... Ke6: 2.Bf7#


407. Pascal Pasture
1.Scd5:? ~ 2.Sd~#
1... Qc7,Qb6,Qb4:,Sc3,Se3,Sf4,Sf6,Qa6,Bf8 2.Sc7:,Sb6:,Sb4:,Sc3:,Se3:,Sf4:,Sf6:,Sb6,Se7# (Themes 1 et 2)
1... Be5,ed5 2.Qc5,Qd5:#
1... Qa2!
1.Sbd5:! ~ 2.Sd~#
1... Qc7:,Qb6,Qb4,Sc3,Se3,Sf4,Sf6,Bf8 2.Sc7:,Sb6:,Sb4:,Sc3:,Se3:,Sf4:,Sf6:,Se7# (Themes 1 et 2)
1... Be5,ed5,b4 2.Qc5,Qd5:,Rc4#
Theme 1 "Fleck 1, forme Burckadt": La cle institue au noirs trois menaces de mat. Chaque coup noir les elimine toutes, saul une. L'unique particularite de ce theme consiste en ce que la menace multiple est une menace deactiverte de batterie blanche.
Theme 2 de la "Rosace du Cavalier Blanc": Ce theme est realiee quand les retraits d'un Cavalier Blanc sur les huit cases de sa rosace, constituent autant de mats distincts a autant de defenses instituees pour le coup de cle.[A].


408. Mircea Manolescu
1... bc4,dc5 2.Rd2,Bb2#
1.Sd8:? ~ 2.Se6# (= set play), 1... d5!
1.Qe6! ~ 2.Qd5#
1... S~,Sc5: 2.Rd2,Bb2#
1... dc5,bc4 2.Qe5:,Qc4:#
(1... d5 2.Qe5:#)
Ruchlis theme and Black Correction.[A].


409. Lars Larsen
1.Bc6? ~ 2.ba5#
1... dc6 2.Sb7#
1... Se6!
1.Bd5:? ~ 2.Sb7#
1... Bc6 2.ba5#
1... Se6 2.Sf7#
1... Ba6!
1.Sc6! ~ 2.ba5#
1... dc6 2.Rd8#
1... Se6 2.Rd7:#
1... Rc2,Bb4: 2.Sf5,Bb4:#


410. John Rice
1.Bf1? ~ 2.Sed3#, 1... Sf3:!
1.Bb1? ~ 2.Sed3#, 1... Sd2! (2.Qa1:?)
1.Bc2? ~ 2.Sed3#, 1... Sb6 2.Qa1:#, 1... Sb2! (2.Qc3?)
1.Be4? ~ 2.Sed3/Sfd3/Sg6#, 1... Se3:! (2.Qe3:?)
1.Bf5? ~ 2.Sed3#, 1... Rd2! (2.Rg5?)
1.Bg6? ~ 2.Sed3#, 1... Rd5! (2.Sg6?)
1.Bh7! ~ 2.Sed3#
1... Sd2,Sb2,Sb6,Sd6,Se3:,Rd2,Rd5 2.Qa1:,Qc3,Qc7,Bg7,Qe3:,Rg5,Sg6#
This problem shows a now old-fashioned idea much worked by other composers; it may, indeed, be completely amticipated. Where to put the BD3? If it leaves the b1-h7 diagonal, Black captures on f3 to gain a flight. Staying on the diagonal, it must take care not to provoke self-interference. This is one of those constructions where no unit can be on any other square. Even the WK must be placed so that 1.Sg6+ is not a cook.[A]


411. Dragan Stojnic (after and dedicated to M. Mladenovic)
1.Qd2? Ke4!
1.Bc2! with 6 to 9 changes


412. Lars Larsen
1.Bf6? ~ 2.Sg5#
1... Bg4: 2.Qg4:#
1... Bf6: 2.Qf6:#
1... Rg8!
1.Sf6! ~ 2.Qh3:#
1... Bh~ 2.Qg4#
1... Bf5 2.Bd5#
1... Se5: 2.Sg5#


413. Mihailo Stojnic
1.Se2? ~ 2.Se7#, 1... Qh4!
1... c4 2.Sd4:#
(1... Qe2: 2.Rh5:#)
1.Sg2? ~ 2.Se7#, 1... c4!
1... Qh4 2.Sh4:#
(1... Qg2: 2.Rh5:#)
1.Qf1! ~ 2.Se7#
1... Qh4 2.Se2#
1... c4 2.Sg2#
(1... Qf2,Bf1: 2.Rh5:,c8QB#)
Ideal form of Vladimirov theme, with changed mates after non-defeating black thematic defences in both tries.[A]


414. Aleksandr Pankratyev
1.Sf7? ~ 2.Re5#
1... Sg5 2.Sfg5:#
1... Bc3!
1.Sd3? ~ 2.Re5#
1... Bc3 2.Sdc5:#
1... Sg5!
1.Sd7? ~ 2.Re5#
1... Sg5 2.Sf6#
1... Bc3 2.Sdc5:#
1... Sc6!
1.Sc6? ~ 2.Re5#
1... Sg5 2.Sg5:#
1... Bc3 2.Sc5:#
1... Sd7!
1.Sg4! ~ 2.Re5#
1... Sg5 2.Sf6#
1... Bc3 2.Re3:#
1... Sc6 2.Qc6:#
1... Sd7 2.Qa8#
1... Qc3 2.Bd5#
1... Re2: 2.Rf4#


415. Dragan Stojnic
1.Bd4! ~ 2.Qc5:#
1... Kd4: 2.Rd3:#
1... Qd4: 2.a8Q/B#
1... Rd4: 2.Se3:#
1... Bd4: 2.e4#
1... Sfd4: 2.Qe5:#
1... Sbd4: 2.Qd6#
1... Sd6 2.Qd6:#
1... cd4 2.Rb5:#
1... ed4 2.Qe4#
First realisation of 8-fold WB sacrifice with all different mates. Equalled record of non-checking sacrifices.[A]


416. Vladan Vuckovic
1... Qe4: 2.Qe4:#
1.Q~? ~ 2.Sef5#, 1... Sf~!
1.Qf6!? Sf~ 2.Qf2:#, 1... Sfg2!
1.Qg5!!? Sf~ 2.Qe3#, 1... Sfg2!
1.Qg4! ~ 2.Sef5#
1... Sf~ 2.Sdf5#
1... Sd5! 2.Be5:#
1... Se~ 2.Sdf5#
1... Sd7! 2.Sc6#
1... Qe4:+ 2.Sef5#
First version (with 20 pieces) was published in "Sahovski vjesnik" 1947. (see diagram) and was commented by Nenad Petrovic as follows: "Black corrections by two BSs in pseudo-"Chicco theme". Exactly 50 years after (couldn't find time earlier!) I rotated the board and added three pieces. Now, besides two black corrections, I obtained a kind of white correction by BQ (1.Q~?, Qf6!?, Qg5!!?, Qg4!!!). Also, one check appeared in the actual play with changed set mate. Is it worth those 15% added pieces?[A]
6K3B7rsQ1P3pPsRSb3k1S1R3P7P1b6rB






#2*vv 12+8
 
Vladan Vuckovic

Sahovski vjesnik 1948

1.Qd7! ~ 2.Sge6#
1... Se~ 2.Sfe6#
1... Sg4 2.Sf3#
1... Sd~ 2.Sfe6#
1... Se4 2.Be5:#


417. Milan Velimirovic
1.Qb4! ~ 2.Sf4:#
(1... Q~ 2.ed8S/ef8S/e8QR#)
1... Qe5: 2.e8Q#
1... Qg5 2.ef8S#
1... Qf7 2.ed8S#
1... Qe7: 2.Qe7:#
1... Rd6 2.Qd6:#
Secondary Fleck duel WP v. BQ in three variations.[A]


418. Miodrag Radomirovic
1.Sb4! ~ 2.Qc7#
(1... c5~ 2.dc8Q/dc8S/d8S#)
1... cd4 2.dc8S#
1... cb4 2.dc8QB#
1... c4 2.d8S#
1... Kb6 2.dc8S#
1... Sd6 2.d8Q#
Secondary Fleck duel WP v. BP in three variations. Task.[A]


419. Milan Velimirovic
1.Qh3! ~ 2.Qe5#
(1... Q~ 2.Rd5/Rd6/Rd7/Rdd8/Re4/Rf4/Rg4/Rh4/*Qe5#)
1... Qd5+ 2.Rd5:#
1... Qc6+ 2.Rd6#
1... Qb7 2.Rd7#
1... Qa8: 2.Rd8#
1... Qe4+ 2.Re4:#
1... Qh2/Qf3 2.Rf4#
1... Qh3+ 2.Rg4#
1... Qh4 2.Rh4:#
1... Kg7 2.Rd7#
Secondary duel WR v. BQ (8). This is a "relaxed" form of Secondary Fleck theme, where a random move by black thematic piece does not stop the threat (i.e. 1... Q~ produces all 8 thematic battery mates plus threatened mate 2.Qe5).[A]


420. Vyacheslav Kamenskiy
1.Rg2! (~)
1... Kd4 2.Rg3 Ke4 3.Qc4#
1... Ke3 2.Ke5 Kf3 3.Qe2#
1... Kf3 2.Qe2+ Kf4 3.Rg4#
1... Kf4 2.Qb3 Ke4 3.Rg4#


421. Vladimir Kozhakin
1.Qe2/Qg2/Qf2? ~ 2.Sc3#
1... Qa5 2.Qb2:#
1... Ka2!
1.Sd4! ~ 2.Sc3#
1... Kc1 2.Qd3 b1Q 3.Se2#
1... Ka2 2.Sc3+ Ka3 3.Qf8#


422. Lars Larsen
a) 1.Qe1! ~ 2.Qg1:#
1... Kg2 2.Qg1:+ Kf3: 3.Qf2#
1... ef3 2.Qg3 ~ 3.Qf3:#, 2... Bf2 3.Sf2:#, 2... Be3: 3.Qh2#
1... Se2 2.Qf1 ~ 3.Sf2#, 2... ef3 3.Qf3:#
b) 1.Kh3! ~ 2.Qg2#
1... ef3 2.Qf4 ~ 3.Qf3:#, 2... B~ 3.Qh2#
1... Se2 2.Qe2: ~ 3.Qg2#, 2... Bf2 3.Sf2:#, 2... ef3 3.Qf3:#


423. Miroslav Subotic
1.Be4? (~)
1... de5 2.Ke6: Ke4: 3.Rc4#
1... Ke4: 2.Rc4+ Kd5 3.Se3#, 2... Kf5 3.Se3#
1... d5!
1.Be7? (~)
1... d5 2.Kg6 Ke5: 3.Bf6#
1... de5 2.Ke6: e4 3.Bf6#
1... Ke5:!
1.Bg7? (~)
1... d5!
1.Bh8! (~)
1... d5 2.Kg7 Ke5: 3.Kg6#
1... de5 2.Kf6 e4 3.Ke6:#


424. Vyacheslav Kamenskiy
1.Rb1!
1... bc1Q+ 2.Kd3 Qb1:+ 3.Sc2#
1... bc1B 2.Sf3+ Kc2,Ke2 3.Rfc1:,Kd4#
1... bc1S 2.Rb2 Sd3 3.Sd3:#
1... Kd2 2.Rb2:+ Kc1: 3.Sd3#


425. Miomir Djurkic
1.d5? Bb7! 2.Ra7/Rc2/Re2 Bc8!/Ba6!/Ba8!
1.Re2? Be6!
1.Ra7? Bb7!
1.Rc1? Bd7!
1.Re1? Bd7!
1.Rc2! ~ 2.Rc8:#
1... Bd7 2.d5 Be6,Bc6,Bc8/Be8 3.de6,dc6,Rc8#
1... Bb7 2.Rc7 ~,Bc8/Bc6 3.Rd7,Rc8:#
All tries have unique refutations![A]


426. Viktor Melnichenko
1.Kh3! e4(~) 2.Sf3+ ef3 3.Rc1#, 2... Kf1 3.Sbd2#
1... f1QRB 2.Sf3+ Qf3: 3.Rf3:#, 2... Kf2 3.Bb6#
1... f1S 2.Rf3 ~ 3.Sf1:#, 2... Sd2: 3.Bd2:#
(1.Rg3:? f1S!)
Half-battery and black corrections in pawn promotions.[A]


427. Viktor Melnichenko
1.Ke8! ~/a5 2.Sd8 Kd6 3.Sf7#
1... S~ 2.d4+ Ke4 3.S7c5#
1... Sd4 2.S3a5 S~ 3.Sc6#
Three model mates and Black Corrections. The last two mates are chameleon-echo.[A]


428. Dragoljub Mirkailo
1.Qg1! ~ 2.Sg3 ~ 3.Qf2#
1... Kf5 2.Sg3+ Kf4 3.Qf2#
1... Ke4: 2.Qg4:+ Ke3 3.Qf3#, 2... Kd5: 3.Qc4#
1... g3 2.Qg3:+ Ke4: 3.Qf3#, 2... Kf5 3.Qf3#
1... Sd6 2.Qg3+ Ke4: 3.Qe5:#, 2... Kf5 3.Qe5:#
1... Sf6/Se7 2.Qf2+ Ke4: 3.Sf6#


429. Zoran Nikolic
1.e7! ~ 2.e8Q ~ 3.Qe6#
1... Ke5 2.e8Q+ Kf4 3.Qb8#, 2... Kd4 3.Sf5#, 2... Kd6 3.Sb5#, 2... Kf6 3.Qe6#
1... Ke7: 2.Rg7+ Kf6 3.Sg4#, 2... Kd6 3.Bg3#, 2... Kd8 3.c7#, 2... Kf8 3.Bb4:#
(1... Rc1: 2.e8Q Rc6: 3.Sd5:#)
Double black king's star flights with 8 distinct mates.[A]


430. Anatoliy Stepochkin
1.b5? ~ 2.Rd5:+(A) Kd5: 3.Rf5:#(B)
1... Bg6 2.Rf5:+(B) Kf5: 3.Rd5:#(A), 2... Bf5: 3.f4#
1... Bb5: 2.Rb4 ~ 3.d4#, 2... d4 3.Rb5:#, 2... Bd3: 3.Sd3:#
1... Bc3!
1.h5! ~ 2.Rf5:+(B) Kf5: 3.Rd5:#(A)
1... Bc6 2.Rd5:+(A) Kd5: 3.Rf5:#(B), 2... Bd5: 3.d4#
1... Bh5: 2.Rh4 ~ 3.f4#, 2... f4 3.Rh5:#, 2... Bf3: 3.Sf3:#


431. Valeri M. Shavyrin
1.Qg1? ~ 2.Bb4+ Kd3/ab4 3.Rd6#
1... Sf1!
1.Bc7! ~ 2.Ba5:+(A) Kd3 3.Rd6#(B)
1... e1~(QRB) 2.Rd6+(B) [2.Bb5?] Ke2 3.Bb5#(C) [3... Ke1??]
1... e1S! 2.Bb5(C) [2.Rd6?] ~ 3.Ba5:#(A), 2... Sd3 3.Sc4# [3...Kd3??]
1... Ke1 2.Qg1+ Kd2,Sf1 3.Rd6,Ba5:#
Corrective promotion in the cyclic 2nd and 3rd white moves form and antidual choice of moves 2.Rd6 and 2.Bb5 with exchange of functions between these two moves (threats 3.Rd6#, 3.Bb5#), with additional change after all promotions. This complex is motivated by the self-blocking promotions.[A].


432. F. Reinhold & A. Pankratyev
1... Rd3: 2.Rd4+ Sf4: 3.Qf5#
1... Qd3: 2.Sc5+ Sc5: 3.Qf5#
1.Qc3! ~ 2.Re3+ Re3: 3.Qe3:#
1... Rd3: 2.Sc5+ Qc5:/Sc5: 3.Qd3:/Rf4:#
1... Qd3: 2.Rf4:+ Sf4:/Rf4: 3.Sc5/Qd3:#


433. Mihailo Stojnic
1... S~ 2.Sf6:+ Kf4: 3.Qd4:#
1... Sf4: 2.Re3+ de3,Kd5 3.Sf6:,Qa2#
(1... b5 2.Sd7: ~,S~,Sf4: 3.Sc5,Sdf6:,Shf6:#)
1.Qa2! ~ 2.Qc4 ~,Se3 3.Qd3,Re3:#
1... S~ 2.Re3+ de3 3.Qc4#
1... Sf4: 2.Sf6:+ Ke5 3.Sbd7:#
(1... b5 2.Sd7:)
Reciprocal change after random and corrective move by BS. Just by chance, there is thematically matching by-variation in the set play 1... b5 with same corrective play on second move.[A]


434. Zoran Gavrilovski
1.Sg4! ~ 2.Be3: ~,fe3,Rd4: 3.Sf2,Re3:,Qd4:#
1... Rd4: 2.Re3:+ fe3 3.Qd4:#
1... Bd4: 2.Bd5:+ Sd5: 3.Qd4:#
1... Bg1 2.Rf4:+ gf4 3.Sf6#
1... Rd7 2.Bf5+ gf5/Sf5: 3.Re6#
1... Be6: 2.Qa2 Rd4: 3.Qe6:#
1... Rf5 2.Rf5: gf5,Bd4: 3.Sf6,Qd4:#


435. V. Kozhakin & V. Melnichenko
1.Kd6? d3/f3 2.Ke5, 1... Ke4:!
1.Ke6! ~ 2.Qf2+ Kd3 3.Kd5 f3 4.Qd2#
1... f3 2.Ke5 f2 3.Kf5 d3/Kf3 4.Qf2#
1... d3 2.Ke5 d2 3.Sd6 d1Q 4.Sc4#


436. Vladimir Kozhakin
1.Qf2? Kf4 2.Qd4+ Kg3 3.Bf5 f2+ 4.Qf2:#; 1... Kh5!
1.Kg2? Kf4!
1.Kf2! (~)
1... Kf4 2.Qa1! Kg4 3.Qh8 Kh~,Kf4 4.Bf5,Qd4#
1... Kh4 2.Kf3 g4+ 3.Kf4 Kh5 4.Qh1#


437. Vladimir Kozhakin
a) 1.Qh4? Kd5 2.Qd4#, 1... Kf5!
1.Qf1? Kd5 2.Qe2 e5 3.Qd3#, 1... Ke4!
1.Ke8? Kd6 2.Qc5#, 1... Kf5 2.Qg4, 1... Kf5!
1.Qg4! Kf5 2.Ke8! Ke5 3.Ke7 Kd5 4.Qe6#, 2... e5 3.Sc5 e4 4.Sd7#
b) 1.Kc7? Kd5 2.Qe2 e5 3.Kd7 e4 4.Qb5#, 1... Ke4!
1. a4? Kd5 2.Qe2 e5 3.Qd3#, 1... Ke4!
1.Qf2! Ke4 2.Ke6 Kd3 3.Kd5 Kc3 4.Qd2#


438. Vladimir Kozhakin
1.Kd6! (~ 2.Kc5 d6+ 3.Kc6 Ka5 4.Ra7#)
1... Ka5 2.Kd7: Ka4 3.Kc6 Ka5 4.Ra7#, 2... Ka6 3.Kc6 Ka5 4.Ra7#
1.Kd4? d6 2.Kc4 3.Sb4 Ka4 4.Ra7#
1... Ka5!


439. V. Kozhakin & A. Shanazaryan
1.Kd3? Bg2:!
1.Kd2! (~)
1... Bg2: 2.Qe3+ Kh1 3.Qe1+ Bf1 4.Qf1:#
1... Kg2: 2.Ke3 Kh3 3.Kf2 ~ 3.Qg3#


440. Vladimir Kozhakin
1.Kc4! ~ 2.Ra7#
1... Ka3 2.Sc2+ Ka2 3.Kc3 ~ 4.Rb2#
1... Ka5 2.Sb3+ Ka6 3.Sc5:+ Ka5 4.Rb5#


441. Borislav Stojanovic
1... Kd3,R~,e2,h6 2.Bf5+,Rc4+,Re2:+,Re2 etc.
1.Ra2! (~)
1... h6 2.Re2 Rd3 3.Re3:+ Re3: 4.Qc4#
1... Rd~ 2.Ra4+ Kd3 3.Ra3+ Kd2,Ke4 3.Qe3:,Re3:#, 2... Rd4 3.Rd4: ed4 4.Qf5#
1... Rb4 2.Qb4:+ Kd5 3.Bd7! ~ 4.Ra5#


442. Yves Cheylan
1.Sf4? bc4! (2.d4 ed3 ep!)
1.Sg1! (~)
1... bc4 2.d3? c3! (3.Sb3? ed3!), 2.d4! c3 3.Sb3! c2 4.Sd2# (3... ed3??), 2... cd3(ep),ed3(ep) 3.Sb3,Sf3 ~ 4.Sd2#
1... b4 2.d4? b3! (3.Sb3? stalemate! - 3... ed3??), 2.d3! ~ 3.Sb3 ~ 4.Sd2#
(This is the improvement of No 132. Mat Plus 8-9/1995).
The primitive version: 1.Sc5! introduces 2.f3 as a threat, and it's a real pity because the thematic variation 1...d4 is not a defence, so the black play lacks of harmony. Moreover, the only defence 1...dxe4 doesn't introduce any threat - a pity now since 2...e3 or exf3 are followed by "duals" in the usual meaning of this word.
The improved version: the theme is lightly stressed by 1.Sf4? bc4!! Curiously, the key has no threat, so that both BP-moves show in a parallel way the accurate opposition between advantage/disavantadge of the same sharp
effect. 1...bc4 2.d3? c3!! so 2.d4! waiting 2...c3 3.Sb3! waiting, c2 4.Sd2# (ed3 e.p.impossible) (2...cd3 e.p.3.Sb3, ~
4.Sd2# 2...ed3 e.p.3.Sf3, c3 4.Sh2# ); 1...b4 2.d4 ? b3!!(3.Sb3? = stalemate: ed3 e.p. impossible) so 2.d3! with a threat 3.Sb3,~4.Sd2# (2...ed3 is NOT a defence, so the dual in 3rd move has no meaning).
When I showed the 1st version by 1995 to Michel CAILLAUD, he failed to improve it - but he told me: you must try to improve it by any mean, even increasing white material. He was right and I'm now convinced a 2d WS is required. Of course, we can remove BPs h5 and h6, with Sh3 on g1 and WPe3 on e2. But the little try disappears and the key would a quite poor one: 1.e3!


443. Yuri Sushkov
1.Rd8(A)? c5(a)!
1.Rd1(B)? c6(b)!
1.Rd3! c6(b) 2.Rd1(B)! c5 3.Sc7 Kb4 4.Ra1 c4 5.Sa6# - switchback
1.... c5(a) 2.Sc7 Kb4 3.Sc6 Ka3 4.Rd8(A)! Ka4 5.Ra8#


444. Tomislav Susic
1.Sc5? Ka2 2.Sb6+ Ka3? 3.Bd6+ c5 4.Bc5:#, 2.... Kb1!
1.Bh4! c5 2.Be7 c4 3.Sc4: Ka2 4.Sa3#


445. Marjan Kovacevic
1.d4! Kg1: 2.e4! Kh1: 3.f4! Kg1 4.Rf3 Kh1 5.Rf1#
The Hultberg's manoeuvre extended to three pawn-clearences. Tho fourth clearence (c2-c4?) is only visual illusion.[A]
46RK4PPP7kS






#4 6+1
 
H. Hultberg

Eskilstuna Kuriren 1942

1.e4!, 2.f4!, 3.Rf3


446. Z. Gavrilovski & B. Miloseski
(*1... c4 2.Bd8 ~ 3.Bb6:#)
1.Bd8? Rh3! 2.Bb6: Rf3:!
1.Sb8? Be8 2.Kc2 c4 3.Sa6: f4 4.e3+
1... c4! 2.Be8 Be8! 3.Kc2? e4!
1.Kc2? f4+! 2.Kb3 Rg5:!
1.Kb3! ~ 2.Bb1 c4+ 3.Kb2 c3+ 4.dc3+ Kc4 5.Bd3#
1... c4 2.Kc2! f4+ 3.Kb2 Rg5: 4.Bd8 ~,c3+ 5.Bb6:,dc3#
(2.Kb2? Be8! 3.Bb1 Bd7:!, 3.Bd8 Re6:!)
Paradoxical "Lepushutz" try supplemented by try 1.Bd8? (which is the main plan in the solution), strategic try 1.Sb8? and the logical one 1.Kc2?. "Lepushutz" theme is shown in the form K/P-escape from check (2.Kb2? Be8!; 2.Kc2! f4+ 3.Kb2!).[A]


447. Bosko Miloseski
1.e8Q? stalemate!
1.e8B? stalemate!
1.e8S? c5! 2.Sf6 c6 3.Sd7 stalemate!
1.e8=R! ~ 2.Rd8 c5 3.Kc5: c6 4.Rd4#
1.... c5 2.Rb8 c6 3.Rb5 cb5 4.Kc5: b4 5.Kc4 b3 6.ab3#


448. Anatoliy Stepochkin
1.Rc4+ Kd5 2.Re4+ Kc5: 3.Rc4+ Kd5 4.Rc1+ Kd4 5.Be6! Sd6 6.Rc5! Kc5: 7.Be3#


449. Gabor Cseh
1.ef6! (~ 2.fe4#) Bd3 2.fe4+ Be4: 3.d3 Bd3: 4.e4+ Be4: 5.Rd3+ Bd3: 6.e4+ Be4: 7.Bc4#
(1... Qg2 2.Rg5+ Qg5: 3.fe4#)
(3... Qg2 4.Rg5+ Qg5:,Bf5 5.de4,Rf5:#)
The 5th WCCT theme comes up four times, but three times with pawns as thematic pieces, which was forbiden in the WCCT![A]


450. Ralf Kratschmer
1.Sb4? Ra5:#
1.Bf6+ Kf4 2.e3+ Re3: 3.Bg5+ Ke5 4.Sb4 Ra5:+ 5.Kb7 Se7 6.Rd5+ Sd5: 7.Sc6#
This problem shows my favorite Berlin-theme.[A]


451. Tomislav Petrovic
1... bc6(ep) 2.gf1B 0-0-0#
Vallodao theme in only three halfmoves. Task.[A]


452. Alexander Grin (+)
a) 1.Kb8 Ba5 2.Kc8 Rd8#
1.Kb8 Rd8+ 2.Kc7 Ba5#
b) 1.Ka7 Bd8 2.Ka6 Ra5#
1.Ka7 Ra5+ 2.Kb6 Bd8#


453. Victor Kolpakov
a) 1.Kd5 Bd4 2.Qd6 Bc4#
b) 1.Ke4 Be3 2.Qe5 Bd3#
c) 1.Be4 Kf1 2.Kf3 Be2#


454. Vladan Vuckovic
1.hg2 Sh3 2.g1S Sf2#
1.h2 Kh3 2.hg1R Kg3#
1.h2 Kh3 2.hg1B g3#
Three different black promotions followed with mate by the white piece of the same kind (BS/WS, BRWR, BB/WB). Miniature.[A]


455. Stanko Milenkovic
B--> 1... Sd4 2.Rd2 Rg1:#, 1.Rc3 Rg2 2.Rc1 Rd2#
W--> 1... Rd6 2.Sg5 Rh6#, 1.g5 Rf3: 2.Rg4 Rh3#


456. Slobodan Saletic
*1... Sg7 2.e5 Sf6#
1.e5? ?? 2.e4 Sf4#
1.Be5 Sg3 2.Rd4 Se3#
Umnov theme with ideal mates in set and actual play.[A]


457. Vladan Vuckovic
1.Bf7: g8S 2.Bd6: d5#
Two white knights are replaced by two black bishops. But a new white knight is born... Excidental twin: WK on h5: 1.Kf6 Sh6 2.Be6 Se8#.[A]


458. Mihailo Stojnic
1.Bc3 Bd4+ 2.Ka1: Rg1#
1.Rc3 Rg3 2.Ka3 Bc5:#
Problem shows following combination: Black unpins white and does the anticipatory self-pin, simultaneously unipnning the mating piece. Pin-model mates, black Leibovici interferences. Two pairs of changed functions of black and white units (WR & WB, BR & BB) and complete D&L analogy of two solution. Meredith with no white pawns. Transformation of white direct battery.[A]


459. Valery Barsukov
a) 1.Qf4 (1.Re5?) Sf3 2.Re5 Qa3#
b) 1.Rf6 (1.Qf4?) Kc2: 2.Qf4 Qc5#
Model mates.[A]


460. Vladan Vuckovic
1.Ke5 Bb1 2.Sd5 Sc6#
1.e5 Bg8 2.Sh3 Bh7#
Oslobadjanje Sf4 (prvi put sa K, drugi put sa P) da bi sekao put Q (prvi put dijagonalno, drugi put ortogonalno). Idealni matovi.
BSf4 is set free twice (first by BK, then by BP) in order to cut the line for BQ (first time diagonal, then lateral). Model mates.[A]


461. Valery Barsukov
a) 1.Sb5 d4 2.Kd5 Sc3#
b) 1.Sd5 Sg3+ 2.Ke5 f4#
c) 1.e5 f3+ 2.Kf5 Sd4#
Model mates.[A]


462. Alexander Grin (+)
1.0-0-0 Kb6 2.Rd7 Ra8#
1.Rh8 Rh1 2.Kf8 Rh8:#
1.e6 Kd6 2.Kd8 Ra8:#


463. A. Ivunin & A. Pankratyev
a) 1.Rh5: Sg4 2.Rd5 Be3#
b) 1.gf6 Be3+ 2.Kd5 Bf3#
c) 1.Rc1: Bf3 2.Rg1 Sg4#


464. V. Zheltonozhko & A.Pankratyev
1.Bc6: Qf5 2.Qb4: Qd3#
1.Sc6: Qh8 2.Qd5: Qc3#


465. Mihailo Stojnic
1.Kd6 Bc4 2.Rf3 Rd4#
1.Kb7 Rg2 2.Bd4 Bf3#
Black unpins one of two pinned black pieces which subsequently opens one the white line and closes the black line. Meanwhile white interferes with black line-mover and mates utilizing the retained pin of another black piece. Complete D&L analogy between two solution and reciprocally changed roles of all thematic black (Ra4&Qh1, Rf7&Be5) and while (Tg4&Be2, Rh7&Bh2) pieces. Also, reciprocally changed destination squares for black and white second moves. No white pawns.[A]


466. Tode Ilievski
1.Sd5: R8h4+ 2.Qd4 Rc1#
1.Sd4 R1h4 2.Bd5: Rc8#


467. Michal Dragoun
1.Qe8: de8Q 2.Rf8: gf8Q#
1.Qf8: gf8S 2.Re8: de8S#
Reciprocal change of capturing pieces on e8 and f8, substitution of white units by two other different pairs.[A]


468. Aleksandr Pankratyev
1.Qd6: Be3+ 2.Kd5: c4#
1.Sge7: c3+ 2.Ke5: Bf4#


469. Albert Grigoryan
1.Rc7 Qb6: 2.Bd5 Qa5#
1.Qc5 Qg3 2.Be2 Qe1#


470. Anatoliy Stepochkin
*1... Sf5 2.0-0-0 Sd6#
1.Se7:+ g6 2.Rd8 Sc7#


471. Eliahu Fasher
a) 1.e1R Ra5 2.Re6: Bd3#
b) 1.Ke6: Rc6:+ 2.Kd7 Rd6#
c) 1.Ke6: Ba6 2.Re5 Bc8:#
d) 1.Ke6: Be2: 2.Rd5 Bg4:#
e) 1.Rg6: Be2: 2.Kg5 Rh5:#


472. Aleksandr Pankratyev
1.Kb2 Qd5 2.Re4 Qb3#
1.Kb3 Qe4 2.Sf3 Qc2#


473. Tode Ilievski
1.Be8: 0-0-0 2.ef6 Rhe1#
1.Qe8: 0-0 2.ed6 Rae1#


474. Valery Barsukov
1.gf2+ Kd1: 2.Ke3 Sc2:#
1.ab2 Ba7+ 2.Kc3 Sd5#
1.gf3 Be5+ 2.Ke4 Bd3#
Model mates.[A].


475. Tony Lewis
a) 1.Kd2 Qh6 2.Rd1 Sf1#
b) 1.Kf3 Qa3 2.Rf2 Sc2#
c) 1.Kf3 Qd6 2.Kf4 Rf5:#
d) 1.Kf2 Qb6 2.Rf1 Sd1#
e) 1.Kd3 Qf6 2.Kd4 Rd5#
f) 1.Kd3 Qf6 2.Kd4 Rd5#
GB Entry for 5th WCCT - Not placed.[A].


476. Jean Haymann
a) 1.Rf3 (Rg3?) Sd3 (Se2?) 2.Qg6 Sf6#
b) 1.Qe6 (Qg6?) Sc7: 2.Rb2 Sg6# (Sd5?)
Mutual preventive unpin of Rb3 and Qf5, underlined by thematic tries. An idea I have been "obsessed" with as exemplified by two problems cited (for other reasons) in Mr. Janevski's article in No.8-9: p.298 (diagram [A]), without thematic tries, and p.280 (diagram [B]) with hidden thematic tries 1.Sb3? Rg12.Sd2 ??... and 1.Sd2? Bf3 2.Sb3 ??... Without tries the unpinning moves are not convincing.[A]
[A] J. Haymann
Boletim da UBP 1994
5r2K4B4b7kP1s1R3qP5p9SR8B






h#2 b) -WSe2 8+6
a) 1.Se3 Rf6 2.Qb4 dc6#
b) 1.Qe5 d6 2.Sd6: Rb2#
[B] J. Haymann
Variantim 1989
2b7R1pP1Qp1B3RK2s8Ps4S2P4pk2p1b7q






h#2 2111 9+10
1.Sc3 Bf3 2.Sd7 Rb6#
1.Sd3 Rg1 2.Sg3 Bd5#

477. Michal Dragoun
a) 1.Be2: Ke5+ 2.Kc3: Kf5:#
b) 1.bc3 Kc4+ 2.Ke2: Kc5:#
Captures of both white knights with different royal battery transformations.[A]


478. Tomislav Petrovic
a) 1.hg3(ep) 0-0 2.cd1S Rf3:#
b) 1.hg3(ep) Be2: 2.cd1B 0-0#
Vallodao theme in both solutions.[A]


479. Anatoliy Stepochkin
1... Be4 2.Rf5 f8Q 3.Re5 Qb4#
1... f8Q 2.Re4 Qb4+ 3.Kd3 Be4:#


480. V. Nesryedov
1.... b7 2.Kc5 Sb3 3.Kb6 b8Q#
1.Kc5 b7 2.Kb6 b8R 3.Ka7 Sc6#

18K2P6SP7k






h#3* 4+1
 
S. Milenkovic

1217. Problem 49-51, 1958

*1... f7 2.Kg5 Sf3+ 3.Kf6 f8Q#
1.Kg5 f7 2.Kf6 f8R+ 3.Ke7 Sg6#
cook: 1.Kg5 f7 2.Kf6 Sd7+ 3.Ke7 f8Q#


481. Albert Grigoryan
a) 1.Kb5 Rf7: 2.Ka6 a4 3.Ra5 Rf6#
b) 1.Qb3+ ab3 2.Kb5 Kb7 3.Rb4 Rf5#
c) 1.Rf5 Rf7: 2.Kc6 Kc8 3.Rc4 Rf6#


482. Dragan Stojnic
1.Kg4 Bg7 2.Bg3 Bh6 3.Bh4 Se3#
1.Re5 Se3 2.Re4 Bg7 3.Be5 Bh6#


483. Sergei Rumyantsew
1.Sg2 Kc6 2.Qe3 Rd5 3.Sf4 Sg5#
1.Ke5 Sf4 2.Qe4 Rd6 3.Sf5 Sg6#
Chameleon echo ideal mates.[MV].


484. Albert Grigoryan
1.f1S Sb4 2.Sg3 Rd1 3.Se2 Sc2#
1.f1R Sc5 2.Rd1 Sb3 3.Rd3: Re1#


485. Albert Grigoryan
1.Kf1 Qd1:+ 2.e1R Qg4: 3.g1R Qf3#
1.g1B Qa2: 2.Sb2 Qb2: 3.Bf2 Qc1#


486. Stefano Spinelli
1.Kc5 Rd2: 2.Kb6 Rd8 3.Ka7 Be3#
1.Ke5 Rh1 2.Kf6 Rh8 3.Kg7 Bb2#
1.Ke3 Bd2:+ 2.Kf2 Be1+ 3.Kg1 Bg3#
1.Kc3 Bd2:+ 2.Kb2 Bc1 3.Ka1 Ba3#
Theme figurative of the black king. Four mates always given by white bishop.[A]


487. Artur Garcer
a) 1.a6 Bf1 2.ab5 Bc4 3.ba4 Bd6:#
b) 1.Ka4: Bd6: 2.Kb5: Bc7 3.Ka6 Bf1#
(komentar autora:
I) a6-b5-a4 <--> a4-b5-a6
II) f1-d6 <--> d6-f1


488. Anatoliy Stepochkin
a) 1.Sc6: Kd5+ 2.Se5 Bd8 3.Sg4 Bg5#
b) 1.Sc7: Ke7+ 2.Se6 Rc8 3.Sg7 Rh8#
Zilahi Theme.[A]


489. Ladislav Salai
a) 1.Sd4 cd4 2.Rc5: bc5 3.Qe3 de3# (AaBbCc)
b) 1.Qe3 de3 2.Sd4 cd4 3.Rc5: bc5# (CcAaBb)


490. Genadiy Chumakov
1... Red3 2.Bd4: Rd4: 3.Kb6 Rd6:#
1... Rdd3 2.Be3: Re3: 3.Kc5 Rc3#


491. Luigi Vitale
1... b3 2.Kd4 Kf3 3.d1S Kf4 4.Sc3 Bf2:#
1... Bh2 2.Kd4 Kf3 3.f1B Kf4 4.Bc4 Bg1#


492. Gabor Cseh
a) 1... fe8B 2.Qc8 g3 3.Kd8 Rc2: 4.Ke8: Rc8:#
b) 1... fe8R 2.Se5 g5 3.Kd7 Sg4 4.Ke8: Sf6#


493. Luigi Vitale
a) 1.Kc6 Rh4: 2.Kd5 Rh2 3.Ke4 Rg2 4.Kf3 Sd2#
b) 1.Kc6 Bg5 2.Kd5 Bh4+ 3.Ke4 Re5+ 4.Kf3 Sh2#


494. Luigi Vitale
a) 1.e6 Sh6 2.Qc5 Kd8 3.Bc6 e4 4.Kd6 Sf7#
b) 1.Be4 Kc7 2.Qc8+ Kb6 3.Qf5 Kc5 4.e6 Sd7#


495. Luigi Vitale
a) 1.Kh2 Kf3 2.e2 Kg4 3.e1S Sh4 4.Sg2 Sf3#
b) 1.e3 Kf3 2.e2 Kg3 3.e1R Sf4 4.Rf1 Se2#


496. Luigi Vitale
1.g5 h4 2.Kh4 Ke6 3.h4 Ke4 4.Kh5 Kf5 5.d5 g4#
1.Kg3: Kd5 2.Kh4 Ke6 3.Kg5 h4+ 4.Kh6: Kf6 5.g5 hg5#


497. Anatoliy Stepochkin
1.a6 Sb5: 2.ab5 Rc4 3.bc4 Rd3 4.cd3 Sg6: 5.Kg6: f8S#
Phenix.[A].


498. Albert Grigoryan
1.f1B Kg7 2.Bd3 Kf6 3.Bc2: Ke5 4.Bg6 Kf4 5.c2 Kg3: 6.c1B Kh3 7.Bg5 g4 #
NOTE: Not computer tested by the editor!


499. Ziva Tomic
1.b1S Kh1 2.Sd2 Kg1 3.Sf3+ ef3 4.e2 Kh1 5.e1S Bb5 6.Sg2: Be8 7.Kh3 Bh5 8.Sh4 Bg4#


500. Miomir Nedeljkovic
1.fg6! ep (~)
1... e6 2.Qd6 hg6#
1... e5 2.Qd7: hg6#
1... d6 2.Be6 hg6#
En passant key and three variations with 13 men only.[A].


501. Vukota Nikoletic
1.Sc7! ~ 2.Sf3+ Sd4: 3.Sd5+ Rd5:#
1... Rg4 2.Sd3+ Rd4:+ 3.Sd5+ Rd5:#
1... Rg6: 2.Sc4+ Kf7 3.Sd6+ Rd6:#
1... Re8 2.Sf7+ Re5 3.Se8+ Qe8:#


502. Aleksandr Pankratyev
1... Sef5: 2.Sg6+ Ke4 3.Qd3+ Bd3:#
1... Shf5: 2.Sf7+ Ke4 3.Qd3+ Bd3:#
1.Qd3! ~ 2.Qe3+ Qe4 3.Qe4+ Be4:#
1... Sef5: 2.Sf7+ Sf7: 3.Qf5:+ Bf5:#
1... Shf5: 2.Sg6+ Sg6: 3.Qf5:+ Bf5:#


503. Milivoj S. Nesic
1... d3 2.Bd2:+(A) Kd4: 3.Sb3+ Rb3:#
1... d5 2.Bd8+(B) Kd6 3.Sb7+ Rb7:#
1.Rb7! ~ 2.Qh2+ Kd5 3.Rb5+ Rb5:#
1... d3 2.Bd8+(A) Kd4: 3.Bb6+ Rb6:#
1... d5 2.Bd2:+(B) Kd6: 3.Bb4+ Rb4:#


504. Victor Kolpakov
a) 1.Bf3 Kg3 2.Bg2 Kf2/h3 3.Be5(+) h3/Kf2 4.Bh2 hg2#
b) 1.Be1 h5 2.Bg4+ hg4 3.Bf2 g3 4.Bg1 g2#


505. Vladan Vuckovic
1.Kh8? ~ 2.Qe7+
1... Kd8 2.Qd7+
1... 0-0-0+!
1.Re6+! Kd8 2.Re8+ Ke8: 3.Kh8!


506. Vukota Nikoletic
1.Qb2! ~ 2.Qe2+ Se2: 3.Bf4+ Sf4: 4.Sd3+ Sd3:#
1... Rd8 2.Bf6+ Kf5 3.Rg5+ Kf4 4.Se6+ Se6:#
1... Ra2 2.f4+ Ke4 3.Bg6+ Sf5 4.Qc2+ Rc2:#


507. Aleksandr Azhusin
1.g5! ~ 2.Rc6+/Bb6+
1... Bg5: 2.Rc6+ Kd5 3.Re6+ Kc5 4.Re5+ Re5:#
1... Rg5: 2.Bb6+ Kd6 3.Bd8+ Kc5 4.Be7+ Re7:#
1... Sc4 2.Sb7+! Kd5 3.Sd6+ Kc5 4.Se4+ Re4:#
Nowotny, white and black battery.[A]


508. Vladan Vuckovic
1.Ka1 Qf1! 2.Qa3! Qd1:+ 3.Qc1 Qe1 4.Qd1 Qf1 5.Qe1 Qe1:#
(1... Qd1:+ 2.Qc1 Qe1 3.Qd1 Qf1 4.Qe1 Qe1:#; 1... Qf1 2.Qa3 Qe1? 3.Qf8! Qf1 4.Re1 Qe1:#)
Duel two Queens[A]


509. Waldemar Tura
1.f8Q! (~)
1... Kg3 2.Qf1 h3 3.Qf6 h2+ 4.Kh1 Kh3 5.Qf2 g3 6.Qf4 g2#
1... g3 2.Qf4 g2 3.e4! de4 4.Qe4: Kg3 5.Qf5 h3 6.Qe4 h2#


510. Aleksandr Pankratyev
1.h3! c2 2.Bd5:+ Kd5: 3.Qd7+ Ke4 4.Sd6+ Kd5 5.Sc4+ Ke4 6.Sd2+ Bd2:#
1... Rg1/Rh1 2.Bf5:+ Kf5: 3.Qf7+ Ke4 4.Sf6+ Kf5 5.Sg4+ Ke4 6.Sf2:+ Bf2:#


511. V. Kolpakov & V. Surkov
1.Qb5+ Rc4 2.f8Q Kd4 3.Qh8+ Kd3 4.Qh1 Kd4 5.Se6+ Kd3 6.Qhh5 Ke4 7.Qbe5+ Kd3 8.Sf4+! Rf4: 9.Qc3+ Ke4 10.Qb4+ Kd3 11.Qh3+ Rf3 12.Qf1+ Rf1:#
NOTE: Not computer tested by the editor!


512. Frank Muller
1.Qf6+ Kg4 2.Rg1+ Kh3 3.Qh6 Kh4 4.f4 Kh3 5.f5 Kh4 6.f6 Kh3 7.f8 Kh4 8.f8B Kh3 9.Bc5 Kh4 10.Bf2+ (Return) Kh3 11.Re1 (Return!) Kg4 12.Qe6+ Kg5! 13.Re5+ Kf4 14.Qf6+ Kg4 15.Re4+ Kh3 16.Qe6+ Bg4 17.Qh6+ Bh5 18.Bg1 hg3 19.Qf4+ Kh3 20.Qf3+ Bf3:#
NOTE: Not computer tested by the editor!


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