Author: Matthew Herman
Date: 17:46:35 12/19/98
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On December 19, 1998 at 20:04:01, Peter Schreiner wrote: >Hallo, > >Now we have these dark and cold days before christmas and there is also a lot of >new chess software available.I collected here some interesting chess positions. >If you have time or interest, please tell me the results of your chess software. >By some positions you may think, that they are simple. But : I have seen, that >it sometimes could happen, that top-programs didn`t recognize a mate in one move >....try it out ! > >Have fun > >-Peter > >----------------------------------------------------------------- > >6n1/prp2k2/1p6/1P2KN2/8/8/8/6R1 w - - id Rxg8 !; > >1.Rxg8 Kxg8 2.Ne7+ Kf7 3.Nc6 1-0 > >----------------------------------------------------------------- >8/8/1p2p3/1P6/5B2/1K6/2B2P2/k3q3 w - - id Bd6 !!!!; > >1.Bd6 1-0 > >----------------------------------------------------------------- >r3kbnr/pp3ppp/1qn1p3/2PpPb2/8/4BN2/PPPNBPPP/R2QK2R b KQkq - id don`t take b2 !; > >1.... Qxb2?? Dangerous ! Better 1..Bxc5 > >------------------------------------------------------------------ > >kn6/b2N4/K7/8/8/8/7Q/8 w - - id mate in ?; > >1.Qxb8+ mate in 2. Try this with Junior 5. 1 .Nxb8 > >Analyse the position with junior 5 after > >kb6/3N4/K7/8/8/8/8/8 w - - id mate in 1 !; > >Junior 5 means : draw !!!!!!! > >---------------------------------------------------------------------- > >2n5/kP6/8/K7/4B3/8/8/8 w - - id promot into a knight; > >1.bxc8N+ 1:0 > >------------------------------------------------------------- >8/8/8/8/3N4/p7/k1K5/8 w - - id mate in 3; > >1.Ne2 ! > >-------------------------------------------------------------- >k7/7p/8/2nKb3/8/8/8/8 w - - id kill the knight and it`s a draw; > >1.Kxc5! the wrong bishop in the endgame ½-½ > >--------------------------------------------------------------- >r4rk1/5p1p/p2RbnpQ/q1p1p2P/1pP1P3/1P3P2/P1N3P1/2K2B1R b - - id Nxh5 ? safty >first; > >1...Nxh5? [1...Rfe8! 2.hxg6 fxg6] 2.g4 Nf6 3.f4 Line > >--------------------------------------------------------------- > >8/2k5/4p3/1nb2p2/2K5/8/6B1/8 w - - id kill the knight --> draw; > >1.Kxb5 different colours of bishops in the endgame ½-½ > >-------------------------------------------------------------- > >8/8/8/5bk1/8/8/4B1PP/5K2 b - - id Bh3 ! --> draw; > >---------------------------------------------------------------------- >5k2/5p1p/2b1pPnP/1p1pP1R1/1PrP4/3Q4/r2B4/3RK3 w - - id 1.Rxg6 ! fxg6 2.Qxg6 !!!; >------------------------------------------------------------------------------ >r1b1kb1r/ppqn1pp1/2p1pn1p/6N1/3P4/3B1N2/PPP1QPPP/R1B1K2R w KQkq - id Bg6 !; >------------------------------------------------------------------------------ >6k1/1p2q2p/5Qp1/3p2K1/3P1PP1/8/7P/8 b - - id 1...h6 ! transforming into a >winning endgame position; >------------------------------------------------------------------------------ >1kbr3r/pp6/8/P1n2ppq/2N3n1/R3Q1P1/3B1P2/2R2BK1 w - - id mate in 11; > >1.Qf4+ gxf4 2.Bxf4+ Ne5 3.Bxe5+ Rd6 4.Bxd6+ Ka8 5.Nb6+ axb6 6.axb6+ Na6 7.Rxc8+ >Rxc8 8.Rxa6+ bxa6 9.Bg2+ Qf3 10.Bxf3+ Rc6 11.Bxc6# 1-0 >------------------------------------------------------------------------------- >r3q1k1/1p1b2bp/r2p2p1/p1pPp1B1/PnP1P1P1/5RN1/1P1QB1P1/6KR w - - id 1.Nf5; > >1.Nf5 gxf5 2.gxf5 Qf7 3.Rfh3 and now ???? Bxf5 4.Rf3 Qd7 5.exf5 Qf7 6.f6 Bf8 >7.Rg3 Kh8 8.Bh5 Qd7 9.Bg6 Nxd5 1-0 >--------------------------------------------------------------------------------- >7Q/kp3ppp/8/8/q3p3/P5PP/5b2/R1R3K1 w - - id 1.Kh1 !!!! wins 1.Kxf2; > >1.Kh1!!! [1.Kxf2 Qb3 Dauerschach] 1-0 >----------------------------------------------------------------------------------- >8/5R2/2p5/8/7P/1K2b3/P3kp2/8 w - - id 1.Kc2!; > >1.Kc2 otherwise the black bishop can stop both pawns or both sides will >underpromote 1....c5 1-0 >------------------------------------------------------------------------------------- >8/7p/8/p4p2/5K2/Bpk3P1/4P2P/8 w - - id 1.g4 !!!!; > >1.g4 !! [1.Kxf5? a4 2.e4 b2 3.Bxb2+ Kxb2 4.e5 a3 5.e6 a2 6.e7 a1Q 7.e8Q >difficult to win] 1...fxg4 2.e4 b2 3.Bxb2+ Kxb2 4.e5 a4 5.e6 a3 6.e7 a2 7.e8Q >a1Q 8.Qe5+ 1-0 >---------------------------------------------------------------------------------------- >3r1rk1/2p1qppp/p1n5/1p1bP1N1/3pNQ2/1P6/PP3PPP/2RR2K1 w - - id 1.Rc6! Bxc6 >2.Nf6+; > >1.Rxc6 Bxc6 2.Nf6+ also difficult to find for the most robots...gxf6 3.Nxh7 fxe5 >4.Nf6+ Qxf6 5.Qxf6 1-0 >----------------------------------------------------------------------------------------- >r1b1r2b/pppq1k2/2n1pP2/3pP1p1/3P4/2PB4/PP1QNP1P/R4RK1 w - - id 1.Bg6 + mate in >13; > >1.Bg6+ Kxg6 2.Qd3+ Kh6 3.Qh3+ Kg6 4.Nf4+ gxf4 5.Kh1 Nxe5 6.dxe5 Qg7 7.Rg1+ Kf7 >8.fxg7 Ke7 9.gxh8Q Kd7 10.Qxe8+ Kxe8 11.Rg7 c5 12.Qh5+ Kd8 13.Qh8# 1-0 >------------------------------------------------------------------------------------------ >7r/4p1k1/p3Pppp/1p6/3N1R2/3PQ2P/qr4b1/5RK1 w - - id 1.Rxf6 !!! mate in 13; > >1.Rxf6 !! 1...exf6 2.Nf5+ ! 2...gxf5 3.Qa7+ Kg6 4.Qf7+ Kg5 5.Qg7+ Kh4 6.Qxf6+ >Kg3 7.Qg6+ Kxh3 8.Qxf5+ Kg3 9.Qf4+ Kh3 10.Qh2+ Kg4 11.Rf4+ Kg5 12.Qg3+ Kh5 >13.Qg4# 1-0 >-------------------------------------------------------------------------------------------- > >6r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - - id 1.Qxg6 ! mate in ?; > >1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kf4 [4...Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 >7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Qa7+ 10.Kb2 Qa1+ 11.Kxa1 Ra8+ 12.Na2 Rxa2+ 13.Kxa2 >Bg5 14.Bh3+ Bc1 15.Rxc1#] 5.Bg3+ [5.Nc2 Matt in 3!] 5...Kg4 6.Be1+ Kh3 7.Bf1+ >Kh2 8.Bg3+ Kxg1 9.Ra1 Ra8 10.Rc1 Ra1 11.Kxa1 Qa7+ 12.Kb2 Qa1+ 13.Kxa1 Ra8+ >14.Na2 Rxa2+ 15.Kxa2 Bg5 16.hxg5 f2 17.Bh3+ f1Q 18.Rxf1# 1-0 >---------------------------------------------------------------------------------------------- >8/5p1k/2pQ2p1/2P2q2/1P5p/5P1P/6PK/8 w - - id 1.b5 !; >-------------------------------------------------------------------------------------------- >3R4/4r1kp/6p1/P4p2/5P2/6P1/6KP/8 w - - id 1.Rd2; > >1.Rd2 Tarrasch says : rook behind the pawn .......Ra7 2.Ra2 1-0 >--------------------------------------------------------------------------------------------- >1n5R/k1Kn4/1p6/1P6/8/8/8/8 w - - id 1.Re8!; > >1.Re8! Bad is 1.Th1? Sc5 2.Ta1+ Sca6 3.bxa6 b5! draw [ also bad is 1.Rd8? Nc5! >2.Rxb8 Ne6+] 1...Nf6 2.Rxb8! Ne8+ 3.Kd7! Nc7 4.Ra8+! 1-0 >---------------------------------------------------------------------------------------------- >8/8/PK1n4/2N5/1k6/8/8/8 w - - id 1.Ne4!; > >1.Ne4 Nc8+ 2.Kc7 1-0 >---------------------------------------------------------------------------------------------- >6k1/6p1/6Pp/ppp5/3pn2P/1P3K2/1PP5/3N4 b - - id 1....Nc3!; > >1...Nc3 2.bxc3 a4 3.cxd4 cxd4 0-1 >--------------------------------------------------------------------------------------------- > >rnb2bkr/ppp1pN1p/1nqpP1p1/8/8/5Q2/PPPP1PPP/RNB1K2R w KQ - id 1. Nh6 + mate in >12; > >Nh6 + mate in 12, ask your robot ...;-)))) >--------------------------------------------------------------------------------------------- >rnb2b1r/ppp1p1kp/1nqpP1pN/8/8/5Q2/PPPP1PPP/RNB1K2R w KQ - id 1.Qf7!; > >1.Qf7 + now it`s mate in 11 .......... > >------------------------------------------------------------------------------------------- > >rnb2b1r/ppp1pQ1p/1nqpP1pk/8/8/8/PPPP1PPP/RNB1K2R w KQ - id 1.d3 mate in 10; > >1.d3 + mate in 10 .... > >------------------------------------------------------------------------------------------ > >rnb2b1r/ppp1pQ1p/1nqpP1p1/7k/8/3P4/PPP2PPP/RNB1K2R w KQ - id 1.g4! mate in 9; > > >1.g4 + mate in 9 ..... and now ? > >------------------------------------------------------------------------------------------- I believe the reason why junior 5 didnt spot the mate with Nb6+ in the position .. W Ka6 Nd7 B Ka8 Bb8 is because it assumes draw because of "no mating material" Matt Herman
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