316. Vladimir Kozhakin Russia
#3 |
b) WPb2-->a4
c) WPb4-->d4
d) WPa2-->h6 |
6+1 |
| a) 1.a3! Kb3 2.Rc6 Ka4 3.Rc3#
b) 1.a3! Kc3 2.Bb5 Kb3 3.Rd3#
1... Kb3 2.Rd3+ Kc4 3.Bb5#
c) 1.Kc2! Kb4 2.a3+ Ka5,Kc4 3.b4,b3#
d) 1.h7! Kb3/Kb4 2.h8Q ~ 3.Qc3#
Miniature quadruples with four different plays. However, first and second position have the same key move, third one has flight-taking key while the last position has banal solution. [Milan Velimirovic]
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317. Aleksandr Chistyakov Latvia
| 1.Bd4! ~ 2.Sc5+ Ka5 3.Bc3#
1... Rc2 2.Ka8 ~ 3.b8S#
1... Rf4 2.fe8S ~ 3.Sc7:#
1... d6 2.fe8Q ~ 3.Qb5/Qc6#
Two WS-promotions after black interferences with correct try-play (1.fe8S? Bh2!, 1.Ka8? Be4!) and WQ-promotion in by-variation. [Milan Velimirovic]
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318. Milan Velimirovic original
| 1... Rc4 2.Re6+ Kd5 3.Re5#
1... Rc5 2.Rdc6:+ Kd5 3.Rc5:#
1.Sf4! ~ 2.Sh5! ~ 3.Rd7#
1... Rc4 2.Rdc6:+ Kd4 3.Rc4:#
1... Rc5 2.Re6+ Kd4 3.Re4#
(1... Se7 2.Ke7: Kf4: 3.Rg6#)
(1... c5,Ra1 2.Re6+,Rdc6:+)
Reciprocal change, Rossel. Flight giving key and hidden quiet threat defeated quite a few solvers! [Author]
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319. John M. Rice England
| 1.Qe8! ~ 2.Qd7:+ Se6 3.Qe6:#
1... Bf3: 2.Rf2+ Be4 3.fg5#, 2... Se4 3.Qd7:#
1... Bd5: 2.Rc5+ Be4 3.Sed7:#, 2... Se4 3.Qh5#
1... Se6 2.Qh5+ Sg5 3.Qg4#
1... fe5 2.Qd7:+ Kf6 3.fg5#
Black obliginly captures a WP on a potential battery-line, so that a bettery-mate is possible after the switchback by the B. There are different mates after 2... Se4 according to where B has played on move 1. Not a very exciting idea, perhaps, but the construction has turned quite neatly. [Author]
For me the idea is exciting enough with two sharp variations resembling on Vissermans style. My (and maybe authors) only regret is that mate 3.Qd7: does not utilize the pin of BS (i.e. if Bg7 and Pf6 could have been removed for 3.Qf7#). [Milan Velimirovic]
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320. Mirko Markovic Yugoslavia
| 1.Bd3? (~)
1... S~,Se4 2.Qf7+ Be6 3.Qf3,Bc4#
1... B~ 2.e8S ~ 3.Sc7#
1... Bd3: 2.cd3 ~ 3.Qf7#
1... Bd7 2.cd7 ~ 3.Qf7#
1... g5 2.Qf5: ~ 3.Qf7#
1... a3!
1.Sd3? ~ 2.Sf4+(Sb4+) Ke4,Kc6: 3.Qe5,Bb5#
1... Ke4 2.Sc3+ Ke3,dc3 3.Bf4,Qe5#
1... Kc4 2.Sb4+ d3 3.Sa3#
1... Kc6: 2.Sb4+ Kd7 3.Bb5#
1... Bd3: 2.Qe5+ Kc4,Kc6: 3.cd3,e8Q#
1... Bd7 2.Qe5+ Kc4,Kc6: 3.Sb2:,Rb6#
1... g5 2.Qf5:+ Kc6:,Kc4 3.Rb6,Sb2:#
1... Sc4 2.Bf3+ Be4 3.Sb4#
1... Sf3!
1.Sg4! ~ 2.Qe5+ Kc6: 3.Bb5#
1... Sf3 2.Qf7+ Be6,Ke4,Kc6: 3.Qf3:,Bd3,Bb5#
1... d3 2.Sc3+ Kc4,Kc6: 3.Se3,Se5#
1... Sc4 2.Qe6+ Be6:,Kc6:,Ke6: 3.Bf3,e8Q,Bc4:#
1... Kc6: 2.Bb5+ Kd5 3.Qe5#
1... Be6 2.Bc4+ Sc4:,Kc4:,Ke4,Kc6: 3.Qf3,Qe6,Qf4,Se5#
Rich changed play in two tries and the solution with corrective effects in first (block) try and two changed continuations (after 1... Kc6: and 1... Sc4) between second try and the solution. However, a little bit too rich for one problem. [Milan Velimirovic]
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321. Zoran Gavrilovski Macedonia
| 1.Be~? Rd4!
1.Bc5!? Rf4!
1.Bd2! ~ 2.e3+ Se2 3.Be2:#
1... Rd4 2.Qg8+ Bg8: 3.cd4#, 2... Se6/Sf7 3.Q:S#
1... Rf4 2.Sd6+ cd6 3.Qc8#
(1... Reg4: 2.e4+ Se2 3.Be2:#)
Corrective WBe3 try play is defeated by corrective moves of the pinned WR, which in teal play appear as the secondary Schiffmann defences against the secondary threat 2.e4+. I composed this problem in memory of my recently deceased pen-friend Robert C. McWilliam from BCPS Book Sales. Schiffmann theme was his favourite one. [Author]
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322. Alexander Zidek Austria
| 1.de5? de5!
1.Ba7! ~ 2.Sb6+ Sb6: 3.Rd6:#
1... Rb3 2.R4e5:+ de5 3.e4#
1... Rd7: 2.R6e5:+ de5 3.Qe6#
1... Qd8 2.Qe5:+ de5 3.Sf6#
1... Sb7 2.de5 (~ 3.Rd4/Bc4,Bb7:#)
Four Raumungsopfer on e5. Friedrich Chlubna thinks it could be a task record for this kind of sacrifices on the same square. [Author]
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323. Mircea Manolescu Romania
| 1.Be7! ~ 2.Bd6:+ Sd6: 3.Qc5#
1... Sfe7: 2.Se1 ~ 3.Sd3:#, 2... Be2,Sb4 3.Re6,Qd6:#
1... Sce7: 2.Se3 ~ 3.Sc4#, 2... d5,Se3: 3.Re6,Qd6:#
(1... d5 2.ef5 d4 3.Qc5#)<[>
Ruchlis theme. [Author]
Good sacrificial key and quiet second moves leading to transferred mates (rather than Ruchlis theme!) after different black second-move sub-variations. [Milan Velimirovic]
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324. Arieh Grinblat Israel
| a) 1.Qd3:! ~ 2.Qa3
1... de3 2.Rb5:+(A) cb5 3.Qd5#
1... Re3: 2.f6+(B) Ke6/Sf5: 3.Qf5#
1... fe3 2.Qe4:+(C) Ke4: 3.f6#
(1... c5 2.Rb5: ~ 3.Rc5:#)
b) 1.Qf3! ~ 2.Sc5
1... de3 2.Qe4:+(C) Ke4: 3.f6#
1... Re3: 2.Rb5:+(A) cb5 3.Qd5#
1... fe3 2.f6+(B) Ke6/Sg5: 3.Qe4:#
Lacny theme. [Author]
Six-lines mechanism, known from twomovers, here is extended to three moves. I am sure that one additional move must be sufficient for the realization in single position, without help of twin. [Milan Velimirovic]
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325. Vladimir Kozhakin Russia
| 1.Qe1! ~ 2.Kc2#
1... Qf5 2.Bc4! ~ 3.Kd2+ Kb2,Qb1 4.Qc1,Qb1:#
2... Qf4+/Qg5+ 3.Kc2+ Qc1 4.Qc1:#
2... Qf2 3.Qf2: a3 4.Qa2#
2... Qf2/Qh5/Qd7 3.Kc2+ Qd1 4.Qd1:#
2... Qe6 3.Be6: a3 4.Kc2#
2... Qb1+ 3.Sb1:
1.Qe5? Qc6 2.Kc2 Qg6+ 3.Se4+ Ka2 4.Qb2#
2... Qe8 3.Qe8: a3 4.Qe1#
1... a3!
1.Kc2? Qf5+ 2.Bd3 Qd3:+ 3.Qd3: a3 4.Qd1/Qf1#
1... Qe6!
Good refutations of two tries and quit second move. Pity for duals after 2... Qe4 3.Qe4:/Se4:, 2... Qf1 3.Qf1:/Bf1: and 2... Qd5 3.Sd5:/Bd5:. [Milan Velimirovic]
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326. John M. Rice England
| 1.Ke8! ~ 2.Qh3+ Kg6 3.Sf8+ Kg7 4.Qh7#, 2... g4 3.Qg5
1... Be5: 2.Sd6+ Bd6: 3.Be6:+ Ke6: 4.Qg4#
1... Qe5: 2.Sd4+ Qd4: 3.Be4:+ Ke4: 4.Qh1#
(1... e3 2.Bf3 (~ 3.Qh7) Qh1 3.Sd4#)
1... Bb5: 2.Qh3+ Kg6 3.Be4:+ Kg7 4.Qh7#
1... ed5 2.Qh3+ g4 3.Qh5+
White would like to check on e6 or e4, but these squares are adequately guarded. So a double-check is necessary, but there are two white units to be cleared from the line on the 5th rank. Black must be induced to capture the Pe5 and then to provide a distant self-block by capturing the WS after it has checked on the second move. The key, introducing a full-length threat, may perhaps be quite a hard to find. [Author]
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327. Arieh Grinblat Israel
| 1.Rf5! ~ 2.Bb6 ~ 3.Sd6#
1... Qf3 2.Bd5+ Kd5: 3.Sd7+ Ke4 4.Sc5#
1... Sf3 2.Rf4:+ Kf4: 3.Sd3+ Ke4 4.Sc5#
White sacrifices in order to bring BK to the battery line with Siers final strikes. Interesting mechanism incorporates also simple dual avoidance after self-blocks. [Milan Velimirovic]
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328. Yury Sushkov Russia
| *1... d6 2.Ba7(A) d5 3.e5(B) d4 4.Rc5#
1... d5 2.e5(B) d4 3.Ba7(A) d3 4.Rc5#
1.Be7! d6 2.Rd5(A) a5 3.Ra5:(D) Kb6 4.Bd8+(B) Kc6 5.Bc7(C) d5 6.ed5#
1... d6 2.Rd5(A) Kb6 3.Bd8+(B) Kc6 4.Bc7(C) a5 5.Ra5:(D) d5 6.ed5#
1... Kb6 2.Bd8+(B) Kc6 3.Bc7(C) d6 4.Rd5(A) a5 5.Ra5:(D) d5 6.ed5#
Cyclic permutation of 2-3 moves in the set play and cyclic permutation of 3-5 moves and 2-4 moves with model mate in the solution. [Author]
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329. Marko Klasinc Slovenia
| 1.Kc6! (2.Ra8#) Sb6 2.Ra8+ Sa8: 3.d7+ Kb8 4.Bd6+ Ka7 5.Bb8+! (5.d8Q?) Kb8: 6.d8Q+ Ka7 7.Qb6+ Sb6: 8.cb6+ Ka8/Kb8 9.Qf8#
1... Kb8 2.Rh7: (3.Qf7) Sc5: 3.Qb1+ Ka8 4.Ra7+! (4.Qb6?) Ka7: 5.Qb6+ Ka8 6.Kc7 (7.Qb8#) Rg7+ 7.Bg7: Se6:+ 8.Kc8 Sc5 9.Qb8#
In an endgame-like attack white sacrifices the Bishop and newly promoted Queen on the field passed over by the black King and black Knight (b8 and b6), in the manner of 5th WCCT theme. There are two additional sacrifices of WR (on a8 and a7), one of them in technical by-variation of the same length. [Marjan Kovacevic]
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330. Tomislav Petrovic & Radovan Tomasevic Yugoslavia
| 1.fg6(ep)! hg6+ 2.Kg4 g5 3.Kf5 g4 4.h7 g3 5.h8S g2 6.Sg6 fg6+ 7.Ke5 g5 8.f7 g4 9.f8S g3 10.Se6 de6 11.Kf6 ~ 12.Ke7 ~ 13.d7 Bd7: 14.Kd7: ~ 15.c8S ~ 16.Sb6#
Task: the longest direct mate with en passant key! [Author]
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