Dann Corbit wrote:I have mechanical (computer generated) solutions for all except these 9:
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q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - acd 44; acs 983; bm Qxe7+; c0 "Stockfish and Houdini both like Qxe7+ to draw"; c3 "Qd4+"; ce 0; pm Qxe7+; pv Qxe7+ Qb7 b6+ Ka8 Qxb7+ Kxb7 a6+ Kxa6 Rxc8 Rxe5+ Kxe5 e2 Ra8+ Kxb6 Rb1+ Kc6 Raa1 c2 Ra6+ Kc5 Ra5+ Kc6 Ra6+;
[Event "-"]
[White "W"]
[Black "B"]
[Result "1-0"]
[SetUp "1"]
[FEN "q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - 0 1"]
1. Qd4+ Kb8 2. Qb6+ Qb7 3. Qxb7+ Kxb7 4. a6+ Kb8 5. Rxc8+ Kxc8 6. a7 Kb7 7.
a8=Q+ Kxa8 8. Kc6 Rh6+ 9. e6 Rxe6+ 10. Kc7 1-0
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1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - acd 39; acs 624; bm Bc5; c0 "Bc5 and Nc5 both draw. Does Nf4 really do better?"; c3 "Nf4"; ce 0; pm Bc5; pv Bc5 Re8 Rd4 Qf5 Rf4 Qh5 Bd6 Rb6 Rh3 Qg5 Rg3 Qh5;
+0,87 1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6
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1r2r1kb/2qn1p1p/3p2pB/pbpP1N2/1n2P3/R4N1P/1P3PP1/1BQ1R1K1 w - - acd 33; acs 333; bm N3d4; c0 "Both Stockfish and Houdini like N3d4"; c3 "Qf4"; ce 83; pm N3d4; pv N3d4 Ba6 Bg5 Kf8 Rg3 Ne5 Nh6 Bg7 Ndf5 Bh8 Qd1 c4 Nd4 Bg7 Nhf5 f6 Bf4 Bc8 Nxg7 Kxg7 Rc3 Bd7 b3 Qb6 bxc4 Rbc8 Be3 Qa6 c5 Rxc5 Ne6+ Bxe6 Bxc5 dxc5 f4 Bd7 fxe5 Rxe5 Qc1 c4 Rxc4;
+0,79 1.N3d4 Ba6 2.Bg5 Kf8 3.Rg3 Ne5 4.Nh6 Bg7 5
+1,10 1.Qf4 Ne5 2.Qh4 Bd7 3.Ne7+ Rxe7 4.Qxe7 Re8
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1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - acd 34; acs 680; bm Bd2; c0 "Rae1, Kh2, and Bd2 are all worth about half a pawn. Is Nh2 better?"; c3 "Nh2"; ce 58; pm Bd2; pv Bd2 Nc6 Rae1 b5 Qg3 Re7 Re3 Qd7 Rfe1 Rce8 Kh2 Na5 Ra1 Nc6 Ree1 Rg8 Ra2 Ra8 Kg1 Ree8 Raa1 Re7 Ra3 Ree8 Re2 Qf7 Ra1 Re7 exf6 Bxf6 Rxe7 Qxe7 axb5 axb5 Rxa8;
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1k2r2r/1p1qb2p/p1p1b1p1/P2pPp2/1P1P4/2RB4/2PBQ1PP/1R4K1 w - - acd 37; acs 1199; bm b5; c0 "Both Stockfish and Houdini like b5"; c3 "Rcb3"; ce 169; pm b5; pv b5 axb5 Rcb3 Ka7 Bxb5 cxb5 Rxb5 Rb8 Rb6 Rhc8 a6 Rc7 axb7 Qa4 Rxe6 Rbxb7 Rxb7+ Rxb7 h3 Kb8 Qd3 Qa3 Qxa3 Bxa3 Re8+ Kc7 Rh8 Kc6 Kf2 Bb2 c3 Ra7 Rb8 Ba3 Ke3 Kc7 Rh8 Kc6 Kd3 Rb7 Rg8 Ra7 Rd8 Be7 Rc8+ Rc7 Ra8 Rb7 Ra5 Rb2 Ra7;
+1,21 1.Bxa6 bxa6 2.Qxa6 Qb7 3.Rxc6 Qxa6 4.Rxa6
+1,33 1.b5 cxb5 2.Bxb5 axb5 3.Rxb5 Ka8 4.Rcb3
+1,34 1.Rcb3 Qc7 2.b5 cxb5 3.Bxb5 axb5 4.Rc3