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MatPlus.Net Forum Competitions Byron Zappas-80 Jubilee Tourney
 
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(1) Posted by Harry Fougiaxis [Thursday, May 17, 2007 19:26]

Byron Zappas-80 Jubilee Tourney


The Greek chess composition committee organises a thematic tournament for direct two-movers, to celebrate the 80th birthday of GM Byron Zappas (born on 06.12.1927)

Theme: #2 featuring a combination of threat correction and black correction. Fairy conditions and pieces are not allowed.

Deadline: 31.01.2008

Judge: Byron Zappas

Entries to Harry Fougiaxis, Delvinou 4, GR-11363 Athens, Greece
email: harryfou@ath.forthnet.gr

Byron Zappas
Eretria 2005
(= 9+9 )
#2
1.Bf~? [2.Sc4#]
1...S~ 2.Rxe4#
1...Sxc3! 2.Bxc3# (secondary) black correction
but 1...Sxg3!

1.Bxe4! [2.Sd3#] threat correction
1...S~ 2.Sf7#
1...Sxc3! 2.Bxc3# (secondary) black correction
1...Sxg3! 2.Qxg3# (secondary) black correction

Valentin Lukyanov
3rd Prize Shakhmaty 1972
(= 8+11 )
#2
1.S~? [2.Be3, Rd1#] but 1...Sf1!

1.Sg5? [2.Rd1#] but 1...Sxe5!

1.Sd2? [2.Be3#] but 1...Qxe5!

1.Sd6! [2.Sb5#] threat correction
1...Sc~ 2.Qc4#
1...Sxe5! 2.Be3# (secondary) black correction
1...Qxe5 2.Rd1#
1...Rxd6 2.Qxd6#

 
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(2) Posted by Jacques Rotenberg [Friday, May 18, 2007 00:09]

what about twins ?
 
 
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(3) Posted by Ion Murarasu [Friday, May 18, 2007 00:56]

Is this a valid exemple for the tourney?
Ion MURARASU
4 HM ,The Problemist 1999,

(= 10+10 )
#2 v v v

1.Sb1? [2.f×g4,B×e3‡]
but 1…K×h2!
1.Sc4? [2.B×e3‡]
1…K×h7 2.Qe5‡
1…S×f3! 2.Sb6‡
but 1…Gf5!
1.Sf1? [2.f×g4,B×e3‡]
1…K×h7 2.Qf6‡
but 1…g×f1=S!

1.Se4! [2.B×e3‡]
1…K×h7 2.Qg5‡
1…S~ 2.f×g4‡
1…S×f3! 2.Sc5‡

 
   
(Read Only)pid=766
(4) Posted by Harry Fougiaxis [Friday, May 18, 2007 01:58]

@ Jacques : Byron did not specifically mention that twins should be excluded, so they are ok.

@ Ion : it is not thematic since there is no threat correction. Bxe3 appears always as a threat.

By the way, let me quote a remarkable composition by the great Rudenko (which is NOT thematic, as it does not feature black correction). It is a very fine example of a white correction + threat correction combination. Those who have "Chess Wizardry : The New ABC of Chess Problems" should have a look at John Rice's excellent analysis in the book.
Valentin F. Rudenko
1st Prize Odessa TT 1986
(= 10+9 )

‡2
1.S4~? [2.Qf4,Sf5‡]
but 1...Rf8!

White correction (anticipatory closing of the f8-f4 line)
1.Sf6? [2.Qf4,Sf5‡], 1...S×d6 2.Q×d6‡
but 1...Bg6!

Threat correction
1.S×c5? [2.Sb3‡]
1...R×c5/S×c5/Kxc5 2.Qf4/Sf5/Qe5‡
but 1...Rb4!

New threat correction
1.S×c3! [2.Se2‡]
1...R×c3/S×c3 2.Qf4/Sf5‡
1...K×c3/B×g4 2.Qd2/Q×h8‡

Some dual avoidance packed in, too, for good measure!
 
   
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(5) Posted by Milan Velimirović (+) [Friday, May 18, 2007 12:45]

Few days before the announcement was published Harry had asked me if I knew about other examples of proposed theme. I answered that I was not sure, forgetting about (can you imagine!) my own twomover published not so long ago. I don't take it as a memorable composition - the fact that even the author couldn't remember it is a proof - but from theoretical point of view it is a very clear example of threat correction + black correction combination, so it will do no harm to quote it here.
 
Milan Velimirovic
1622. Mezija jan/mart 2000
(= 10+8 )

#2*v...
Set: 1... Se~ 2.Bc3:#
1.S~? (=b6) ~ 2.Rd5#
1... dc6!
1.Sb4!? ~ 2.Rd5#
1... dc6 2.Sc6:#
1... Sc5!
1.Sf4!? ~ 2.Rd5#
1... dc6 2.Se6#
1... Sf6!
1.Se3:! ~ 2.Sf5#
1... Se~ 2.Rd5#
1... Sc5 2.Rb4#
1... Sf6 2.Qe5#
1... Ke3: 2.Qf2:#

 
 
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MatPlus.Net Forum Competitions Byron Zappas-80 Jubilee Tourney