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MatPlus.Net Forum General Kohnlein’s idea
 
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(1) Posted by Marek Kwiatkowski [Tuesday, Jan 8, 2008 15:47]; edited by Marek Kwiatkowski [08-01-09]

Kohnlein’s idea


I would like to show some possibilities of original interpretation of an old idea.
Perhaps somebody knows another example of this very interesting idea.

Friedrich Kohnlein
Münchener Neueste Nachrichten 1909 (v)
(= 3+5 )

#8

1.Rd7! Bg6 2.Rd6! Bf5 3.Rd5! Be4 4.Rd4 Bh7 5.Be4! Bxe4 6.Rxe4 Kb1 7.Rc4 Ka1 8.Rc1#

Marek Kwiatkowski
Schach 1993
(= 6+9 )

win

1.a8R! (1.a8Q? Bxh8!=) Ba1 2.Rg8! Bb2 3.Rb8! (3.Rxg6+? Kxg6!) Bc3 4.Rc8 Bd4 5.Rd8 Be5 6.Re8 Bf6 7.Rf8 Be7! (7…Ba1 8.Bf6 +-) 8.Rf7! Bf6 9.Rxh7+! Kxh7 10.Bxf6 +-

Marek Kwiatkowski
Schweizerische Schachzeitung 2007
(= 6+6 )

#7

Two logical tries 1.Bxh7?? or 1.f8Q? Bxf5! 2.Qxf5 lead to stalemates.
The immediate under-promotion 1.f8R!? starts a cunning plan.
After obvious 1…Bg6, White is going to move the black Bishop on the left side, and then it would be possible to capture his there. Thus 2.Bg4! (~ 3.Rf1+ Bb1 4.Bd1) and now the reckless move 2…Bb1? is followed by 3.Bf5! B~ 4.BxB PxB without stalemate, so Black must delay the capture 2…Bd3! 3.Bf5 Be2! (not 3...Bf1? 4.Be4! Bh3 5.Rh8 Bf1 6.Rh1 dxe4 7.Rxf1#) 4.Re8 Bd1 5.Bd3! Bc2! 6.Bxc2 bxc2 7.Re1+ c1~ and the time is over.
The key 1.g6! starts a reverse plane. After 1...Bxg6 2.f8R! Bh7, White is going to force the black Bishop to capture one’s opponent. Thus 3.Rf7! (3.Rf6? Bg6!) Bg6 4.Rf6 and now 4...Bh7 is followed by 5.Bg6! Bxg6 6.Rxg6 Kb1 7.Rg1#. Black can play better 4…Bh5! with an ambush 5.Bg4? Bg6! 6.Rxg6 Kb1 7.Rg1#??, but the sacrifice 5.Bd3! leads to goal 5...Bd1 6.Rf1 cxd3 7.Rxd1# or 5...Be2 6.Bxe2 Kb1 7.Rd1#.
 
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MatPlus.Net Forum General Kohnlein’s idea