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| (1) Posted by Linden Lyons [Wednesday, Oct 9, 2013 14:20] |
Meaning of "šachový šach"?
Could someone tell me the meaning of "šachový šach"? I'm interested in the second problem on page 50 of the Marianka bulletin. Google Translate was unhelpful.
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| (2) Posted by Juraj Lörinc [Wednesday, Oct 9, 2013 14:54] |
Šachový šach = (loosely speaking) Check Chess.
The aim of problems in Check Chess is to give check that cannot be answered by check.
Bedrich Formanek
Special Prize Sachove Umenie 1975
 (= 8+5 )
+2 Check Chess (8+5)
Immediate 1.Sc8+ can be answered by 1...Ka5+, that is why the set play 1...Qa5 2.Sc8+ works.
The other set play is 1...Rb7 2.cxb7+
The key 1.Rh5! creates threat 2.Rb5+.
Black queen defends three times by guarding b5, allowing 2...Qxb5+, but naturally there are other checks:
1...Qa5 2.Bc5+ (compared to set play, c6 is unguarded, c5 is guarded)
1...Qxc6+ 2.Sc8+ (compared to set play, c6 has to be blocked while a5 is guarded)
1...Qa6 2.Sa8+ (also blocking)
1...Ka7+ 2.Sb5+
1...Rg5 2.Qb2+
1...Rg1+ 2.Qxg1+
This was one of Check Chess prototypes. There was a thematical tourney for Check Chess in Slovakia back in 1970s, here is the winner:
Karol Mlynka
1st Prize SUV CSZTV C 31.1.1977
 (= 9+14 )
+2 Check Chess (9+14)
Can anybody solve this and get the idea? Don't forget the name above diagram...
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| (3) Posted by Jacques Rotenberg [Wednesday, Oct 9, 2013 19:08] |
seemingly the condition is only for white, otherwise
1...Qxc6+ 2.Sc8+
1...Ka7+ 2.Sb5+
1...Rg1+ 2.Qxg1+
are not variations
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| (4) Posted by Juraj Lörinc [Wednesday, Oct 9, 2013 19:37] |
I understand it in a way that checking variations do not reach aim for Black. While Black gives check, White can parry it by check and therefore Black has not reached the aim.
However, as given in Marianka bulletin, Bedrich Formanek is an inventor. He or perhaps someone else among people who were composing back in 70s could explain (I have started only in 90s).
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| (5) Posted by Geir Sune Tallaksen Østmoe [Wednesday, Oct 9, 2013 19:46] |
I think I have solved the Mlynka problem.
1.Ke2! threatening 2.Bxd3+.
1...Ke4 2.Rxe7+
1...Kf4 2.Bc7+
1...Kg4 2.Rg1+
1...Kf6 2.fxe8N+
1...Kg6 2.fxe8Q(B)+
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| (6) Posted by Juraj Lörinc [Wednesday, Oct 9, 2013 20:10] |
Yes, the solutions is OK, well done.
Additionally there is set play...
1...Kf6 2.Bxe7+
1...Kg6 2.Rg1+
... and an option try...
1.Ke3? th. 2.Rxf2+, 1...Bd6!
... with two variations ...
1...Kf6 2.fxe8S+
1...Kg6 2.fxe8Q+
... showing reciprocal change of defence motifs compared to the solution (unpin of S, leaving the threat check line).
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| (7) Posted by seetharaman kalyan [Friday, Oct 11, 2013 19:48] |
Very nice to see that interesting problems can be composed with '+2' as aim !
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| (8) Posted by Geoff Foster [Friday, Oct 11, 2013 23:52] |
The following "check in 2" is very interesting.
Stephen Rothwell, The Problemist Supplement 2003
 (= 8+9 )
+2 (mate prohibited)
1.Sxc3+?? or 1.Sxe3+?? are illegal because they are also mate. A try such as 1.Bg7? gives the bK a flight on d6 and threatens 2.Sxc3+ and 2.Sxe3+, but 1...d6! blocks the flight. A try such as 1.Bc7? gives the bK a flight on d4 and threatens 2.Sxc3+ and 2.Sxe3+, but 1...Sd4! blocks the flight. The next try and key then show the Pseudo Le Grand theme, as follows:
1.b4? (2.Sxc3+)
1...Sc4 2.Sxe3+
1...Kc4 2.Sb2+
1...c4!
1.fxg4! (2.Sxe3+)
1...Se4 2.Sxc3+
1...Ke4 2.Sf2+
The key gives a flight that Black cannot block. The full solution also shows the Barnes theme! WinChloe solves this correctly, but Popeye does not (unless it has some "mate prohibited" condition).
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