62 test positions from last couple of months

[peter]

Just for comparison H6.03T(actical1):
(Same hardware, still 1'/pos.)

Code: Select all

1. Neghina,M - Standstill,  VL   > 60s.
2. HalloweenPuzzle,W - Akobia,G,  VL   Gelöst in 22.04s/25; Gelöst: 1
3. ERET 020 - Laeuferopfer h7,  VL   Gelöst in 0.76s/12; Gelöst: 2
4. Caruana - Carlsen,  VL4 Game8 WCC18 Remis 23. Deviation   Gelöst in 18.03s/22; Gelöst: 3
5. Rybka - Forum?,  VL40-5 2x#12   Gelöst in 0.72s/14; Gelöst: 4
6. LC0,A - SF8,A,  VL40-6   Gelöst in 0.89s/12; Gelöst: 5
7. Noomen,H - Book,8,  VL40-7   Gelöst in 10.61s/20; Gelöst: 6
8. NotSoDifficult,F - NoSoDi,F,  VL40-8 #12 NoSoDiFHAE   Gelöst in 0.91s/14; Gelöst: 7
9. Rybka,F - Corbit,D,  VL40-9   Gelöst in 23.87s/20; Gelöst: 8
10. ERET 019 - Endspiel,  VL   > 60s.
11. ,  VL   > 60s.
12. ,  VL   Gelöst in 25.12s/32; Gelöst: 9
13. ,  VL   Gelöst in 15.57s/24; Gelöst: 10
14. ERET 084 - Koenigsangriff,  VL   > 60s.
15. ,  VL   Gelöst in 32.99s/34; Gelöst: 11
16. ,  VL   Gelöst in 0.81s/11; Gelöst: 12
17. ,  VL   > 60s.
18. ,  VL   > 60s.
19. ,  VL   Gelöst in 41.18s/24; Gelöst: 13
20. ,  VL   Gelöst in 34.82s/40; Gelöst: 14
21. ERET 066 - Endspiel,  VL   > 60s.
22. ,  VL   Gelöst in 16.01s/30; Gelöst: 15
23. ,  VL   Gelöst in 15.07s/29; Gelöst: 16
24. ERET 096 - Endspiel,  VL   > 60s.
25. ,  VL   > 60s.
26. ,  VL   Gelöst in 7.46s/19; Gelöst: 17
27. ,  VL   > 60s.
28. ,  VL   Gelöst in 19.64s/21; Gelöst: 18
29. ERET 036 - Endspiel,  VL   Gelöst in 15.29s/21; Gelöst: 19
30. ERET 002 - Zugzwang,  VL   Gelöst in 11.06s/21; Gelöst: 20
31. ,  VL   Gelöst in 21.53s/21; Gelöst: 21
32. ,  VL   > 60s.
33. ERET 057 - Abtausch,  VL   > 60s.
34. ,  VL   Gelöst in 28.03s/20; Gelöst: 22
35. ,  VL   Gelöst in 57.49s/22; Gelöst: 23
36. ,  VL   Gelöst in 30.94s/25; Gelöst: 24
37. ,  VL   Gelöst in 0.76s/12; Gelöst: 25
38. ERET 059 - Endspiel,  VL   Gelöst in 3.48s/17; Gelöst: 26
39. ,  VL   Gelöst in 29.95s/24; Gelöst: 27

Ergebnis: 27 aus 39 = 69.2%. Durchschnittszeit = 17.96s / 21.70

[jdart]

Can someone post the latest 40-move set?

--Jon

[peter]

Can someone post the latest 40-move set?

Sorry, Jon, 40 was my mistake, it's 39 and I have them from Vincent's post:

From about 100 positions in this thread, I removed easiest, incorrect and well known ones.
It's still 39 positions (still 9 positions from the ERET set) :

Code: Select all

1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - bm Nc6; 
1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - - bm e5+;
1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - bm Bxh7; id "ERET 020 - Laeuferopfer h7";
1r1q1rk1/1p2b2p/pN6/P1pP1bp1/5p2/2B2Q2/1P4PP/R4RK1 w - - bm g4;
1r3rk1/1pB2ppp/2b1p3/3pP3/p4Q2/P2B4/1P3PPP/2R3K1 w - - bm Bxh7+; c0 mate in 12 ;
1r3rk1/3bqpp1/p3p2p/n1ppP2N/2nP1P1P/2PQ1N2/P3B1P1/2R2RK1 w - - bm Ng5;
1rbq1r1k/7p/2np2p1/p2N1p2/R1B1PP1b/1PP1N3/8/3Q1K1R w - - acd 40; acs 294; bm Ra2; ce 143; pm Ra2;
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - - bm Nh5+;
2r2r1k/qb3p1p/p2p1Np1/np1Pp1P1/2P5/3RP2P/5R2/4Q1K1 w - - acd 36; acs 174; bm Rf4; ce 0; pm Rf4;
3kB3/5K2/7p/3p4/3pn3/4NN2/8/1b4B1 w - - bm Nf5; id "ERET 019 - Endspiel";
3q1r1k/6rp/3p4/P2Pbp1Q/N3Pp1n/2P5/P1B2RPP/R6K b - - bm f3;
3r3r/k7/2p5/1pPp1p1p/pP2pPpP/P1K1P1P1/2b5/BN6 w - - bm Kd4;
4b3/4kp1p/2pq1p2/p3pQ2/2B1P2P/5RP1/Pr1r1PK1/2R5 b - - bm h5; c0 "Laser 191118-Ethereal 11.13, CCC3 Rapid Redux, chess.com 2018";
4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - bm Bg7; id "ERET 084 - Koenigsangriff";
5k2/8/5pK1/5PbP/2Bn4/8/8/8 b - - bm Bh4;
5nq1/1p1p2p1/8/B3p3/k7/5K2/2P2PP1/3Q4 w - - bm c4+;
6k1/1qr1p2p/ppN5/3p1N2/6p1/1P1P2Pp/PP2PP1P/2RK4 w - - bm Ncxe7+;
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+;
8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - bm Qh3;
8/1p1pNpbk/1q1P4/pP2p2K/P3N3/4P1P1/3P4/8 w - - bm Nc8;
8/2pN1k2/p4p1p/Pn1R4/3b4/6Pp/1P3K1P/8 w - - bm Ke1; id "ERET 066 - Endspiel";
8/2pb1k1K/3p2p1/5pP1/2PPpB2/PP6/8/8 b - -  bm e3; 
8/2r3k1/8/1p1p1p2/p2PbPp1/PB4P1/1P1K4/5R2 w - - bm Rc1; c0 fortress;
8/8/4p1Pk/1rp1K1p1/4P1P1/1nP2Q2/p2b1P2/8 w - - bm Kf6; id "ERET 096 - Endspiel";
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - bm Nc7;               
br1r2k1/5pp1/R6p/2pN4/P1P1q3/2P1p1P1/P3P2P/3RQ1K1 b - - bm Qxc4; c0 "Deep Shredder 13-Komodo 12.2.2, Andreas Strangmueller 2018";
r1b1qk1r/pn3pp1/1p2p3/3pP1Bp/1bPN4/4Q1R1/P2N1PP1/R5K1 w - - bm Bf6; 
r1b2rk1/pp3ppp/1n2p3/3pP3/2PN1BPq/b1PB4/P1Q2P1P/1K1R3R w - - bm Nf3;
r1k1n2n/8/pP6/5R2/8/1b1B4/4N3/1K5N w - - bm b7; id "ERET 036 - Endspiel";
r1n2N1k/2n2K1p/3pp3/5Pp1/b5R1/8/1PPP4/8 w - - bm Ng6; id "ERET 002 - Zugzwang";
r1qn1rk1/p1pp1ppp/1p2p2b/1P2P3/P7/R2B1N2/1P4PP/3Q1R1K w - - bm Bxh7+;
r2q1rk1/p1pn1p2/1p2pPp1/3p2B1/2PP3Q/2b5/PP3P1P/2KR2Nb w - - bm Rd3;
r2qr1k1/pp1bbp2/n5p1/2pPp2p/8/P2PP1PP/1P2N1BK/R1BQ1R2 w - - bm d6; id "ERET 057 - Abtausch";
r3k2r/bppbqp2/P1np2n1/1B6/3pP1p1/P1P3B1/3N1PPN/R2Q1RK1 b kq - bm O-O-O;
r3r1k1/1b1n1pbp/pq1p2p1/1pp1P3/3P1B2/nP1B1NNP/P4PP1/R2QR1K1 w - - acd 40; acs 1082; bm Nh5; ce 142; pm Nh5;
r4nk1/1p1rqp1p/2bNp1pP/3pP3/BR3QP1/P4R2/5P2/6K1 w - - bm Bxc6; c0 "Stockfish 18112008 - Xiphos 0.4.11, CCC 3: Rapid Redux 2018";
rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - bm Qh5+;
rq6/5k2/p3pP1p/3p2p1/6PP/1PB1Q3/2P5/1K6 w - - bm Qd3; id "ERET 059 - Endspiel";
rqn2rk1/1p2ppb1/p1b3pp/2R1P1N1/8/4BB1Q/3R1PPP/6K1 w - - acd 40; acs 177; bm Nxf7; c3 "Nxf7"; ce 309; pm Nxf7;

[Vinvin]

I have some doubts about this one :

4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - bm Bg7; id "ERET 084 - Koenigsangriff";

Is Bg7 clearly better than the second move ?

[Dann Corbit]

I am analyzing the following set of positions:
4r1k1/1r1np3/1pqp1pp1/p7/2b1P1PQ/2P2P2/P2BB2R/3R2K1 b - -
4r1k1/1r1np3/1pqp1pp1/p7/2b1P1PQ/2P1BP2/P3B2R/3R2K1 b - -
4r1k1/1r1np3/1pqp1pp1/p5B1/2b1P1PQ/2P2P2/P3B2R/3R2K1 b - -
4r1k1/1r1np1B1/1pqp1pp1/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 b - -
4r1k1/1r1np3/1pqp1ppB/p7/2B1P1PQ/2P2P2/P6R/3R2K1 b - -
4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - -

Which contains the position after each of the five feasible best move candidates, and then the original position.
I think we should know after the analysis finishes.

[Dann Corbit]

e.g., the first alternative looks very drawn so far:

Code: Select all

Searching: 4r1k1/1r1np3/1pqp1pp1/p7/2b1P1PQ/2P2P2/P2BB2R/3R2K1 b - - 0 1
infinite: 0 time: 0 increment: 0 moves to go: 0

 1   -3.06   00:00    2854  Kf7
 2   -5.56   00:00   44698  Kf7 Qh7+ Ke6
 3   -0.50   00:00   2037K  Nf8 a3 Bxe2
 4   -0.67   00:00   2162K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 Kf7 gxf6 exf6
 5   -0.67   00:00   2234K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 Kf7
 6   -1.11   00:00   2275K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 fxg5 Bxg5 Qxc3 Rc1
 7   -0.37   00:00   2416K  Nf8 Bxc4+ Qxc4 g5 Kf7 gxf6 exf6
 8   -0.36   00:00   2440K  Nf8 Bxc4+ Qxc4 g5 Kf7 gxf6 exf6 Bh6 Qc5+ Kh1 Ne6
 9   -0.36   00:00   2460K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 fxg5 Bxg5 Qxc3 Rc1
10   -0.26   00:00   2494K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 Kf7 gxf6 exf6 Bh6 Qxc3
11   -0.55   00:00   2533K  Nf8 Bxc4+ Qxc4 g5 Kf7 gxf6 exf6 Bh6 Qc5+ Kg2 Qxc3 Rxd6 Ne6 Bf4 Nxf4+ Qxf4
12   -0.55   00:00   2635K  Nf8 Bxc4+ Qxc4 g5 Kf7 gxf6 Qc5+ Kg2 exf6 Bh6 Qxc3 Rxd6
13   -0.25   00:00   2682K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 Kf7 gxf6 exf6 Bh6 Qxc3 Qg3 Rd7 Rg1 Rc7
14   -0.40   00:00   2804K  Nf8 Bxc4+ Qxc4 g5 Qc5+ Kh1 Kf7 gxf6 exf6 Bh6 Qxc3 Rh3 Rc7 Bxf8 Rxf8 Qh7+ Ke8 Qxg6+ Kd8
15   -0.39   00:00   3153K  Nf8 Bxc4+ Qxc4 g5 fxg5 Qh6 Qc5+ Kg2 Kf7 Rc1 Rc8 Bxg5 Ke8 Be3 Qc4 Kg3 Qf7 Rcc2
16   -0.40   00:00   6204K  Nf8 Qh8+ Kf7 Bxc4+ Qxc4 Bh6 Qc5+ Kg2 Ke6 Qg8+ Kd7 Bxf8 Rbb8 Qxg6 Rxf8 Rh7 Rh8
17   -1.52   00:01  12128K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qb5 Rd5 Qc6 gxf6 Qxc3 Bd4 Qe1+ Bf2 Qc3 fxe7 Rbxe7 Kg2 Re6 Rh3
18   -1.43   00:01  13493K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 d5 gxf6 exf6 Qh8 Rd7 e5 Rxe5 Bh6 Ne6 Qh7+ Ke8 Qg8+ Ke7 Qxg6 Qc6 Rc1 Rd8
19   -0.73   00:01  16892K  Nf8 Bxc4+ Qxc4 f4 Kf7 f5 Qxe4 Re1 Qd3 Qh8 Rc8 Bh6 Qg3+ Kf1 Qf3+ Rf2 Qh3+ Rg2 Qh1+ Kf2 Qh4+ Ke2 gxf5 Qg7+ Ke8 Kd1
20   -0.89   00:01  18396K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Qxc3 Bd4 Qc6 g5 fxg5 Qh6 Kf7 Qxg5 e5 Be3 d5 Rxd5 Qf6 Qxf6+ Kxf6 a4 Ne6 Rb2 b5 axb5 Rh7 b6 Reh8 Rxa5
21   -1.00   00:02  28491K  Qc5+ Kg2 Nf8 Be3 Qc7 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Ke8 Bxf6 Rf7 Bg5 Rc5 Be3 Rc6 Rd5 Qf6 Qxf6 Rxf6 Bd4 Rf7 Rh6 Ne6 Rxg6 Ke7 e5 dxe5 Bxe5
22   -1.05   00:04  40583K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Ke8 Bxf6 Rf7 Bg5 Rc5 Be3 Rc6 Rd5 Qf6 Qxf6 Rxf6 Bd4 Rf7 Rh6 Ke7 Rg5 Rc4
23   -1.08   00:04  45071K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Rc8 g5 Qe6 Bd4 Kf7 gxf6 exf6 Qh8 Ke8 Bxf6 Rf7 Bg5 Rc5 Be3 Rc6 Qd4 Qf6 Qxf6 Rxf6 c4 Rxc4 Bxb6 a4 Rhd2 Rc3 Rf1 Rc6 Ba5 Rf7 Bb4
24   -0.94   00:05  51881K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Rc8 g5 Qe6 gxf6 Qe5+ Kf2 Qxf6 Qxf6 exf6 Rxd6 Rxc3 Rxf6 Rf7 Rxf7 Kxf7 Bxb6 Ra3 Kg3 Nd7 Bd8 Nf6 Kf4 Nh5+ Kg4 Nf6+ Bxf6 Kxf6 Rf2 a4 f4 Re3 e5+ Kf7
25   -0.79   00:09  90073K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 c4 Qf7 e5 Ne6 Qe3 g5 Rh8+ Kd7 Rxd8+ Kxd8 exd6 Qf4+ Qxf4 gxf4+ Kg4 Nxd4 Rxd4 exd6 Rxd6+ Kc8 Rc6+ Rc7 Rxc7+ Kxc7 Kxf4 Kc6 Ke4 Kc5 Kd3
26   -0.71   00:11 110593K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 Qe3 Qf7 a4 Ne6 Bxb6 Rc8 Bxa5 Ng7 Kf2 Rb2+ Rd2 Rxd2+ Qxd2 Nh5 Bb4 Qe6 Qd5 Qf6 Qb7 Qe6 Ke3 Kf7
27   -1.15   00:15 142043K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 Qe3 Qf7 a4 Rc8 Bxb6 Ne6 Bxa5 Ng7 Rh8+ Kd7 Rxc8 Kxc8 Qc5+ Kd7 Bb6 Nh5+ Kf2 Qf4 Qb5+ Ke6 Rxh5 Rxb6 Qc4+ Kf6 Qd4+ e5 Qxb6 Qd2+ Kg3 gxh5 Qd8+ Kg7 a5 Qe1+ Kg2 Qd2+ Kh3
28   -0.94   00:16 151682K  Qc5+ Kg2 Nf8 Be3 Qc8 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 Qe3 Qf7 a4 Rc8 Bxb6 Ne6 Bxa5 Ng7 Rh8+ Kd7 Rxc8 Kxc8 Qc5+ Kd7 Bb6 Nh5+ Kf2 Qf4 Qb5+ Ke6 Rxh5 Rxb6 Qc4+ Kf6 Qd4+ Ke6
29   -1.11   00:24 226256K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 f5 Re1 Rc8 Rhe2 f4+ Qxf4+ Ke8 Rh2 Qf7 Qg4 Qe6 f4 Qxg4+ Kxg4 b5 e5 dxe5 Rxe5 Rc4 Rh8 b4 Rxa5 bxc3 Bxc3 Rxc3 Ra8+ Kd7 Rhxf8 Rb2 Ra7+ Rc7 Ra6 Rcc2 Rxg6 Rxa2
30   -1.02   00:29 270466K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Ke8 Qxf6 Qxf6 Bxf6 Rc6 Rb1 Rf7 Bd4 Nd7 Rh8+ Rf8 Rh6 Ne5 f4 Nd3 Rh4 Nc5 Bxc5 g5 fxg5 Rxc5 g6 Rxc3+ Kg4 Rf2 Kh5 Rxa2 Rg4 Kf8 Rxb6
31   -1.00   00:31 294005K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Ke8 Qxf6 Qxf6 Bxf6 Rc6 Rb1 Rf7 Bd4 Ne6 Rh8+ Kd7 Ra8 g5 Ra7+ Ke8 Rxf7 Kxf7 Rxb6 Nxd4 Rb7+ Ke6 cxd4 Rc2 a4 Ra2 d5+ Kf6 Rd7 Ke5 Re7+ Kd4 Re6 Kc5 Kg4 Rxa4 Kxg5 Ra2
32   -0.84   00:48 452032K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Re7 Rb1 Rc6 Rb5 d5 Rxd5 Rd7 Rxd7+ Qxd7 a4 Qd6+ e5 fxe5 Bxe5 Qc5 Rh1 Qe3 Rd1 Qg5+ Kf2 Re6 f4 Qh5 Qxh5 gxh5
33   -0.66   01:40 949808K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Bd4 Rc8 gxf6 exf6 Qh8 Re7 Rb1 Rc6 Rhb2 Rb7 Rh1 Ke8 Qxf6 Qxf6 Bxf6 b5 Rhb1 d5 Bd4 dxe4 fxe4 b4 a3 Re7 axb4 axb4 Rxb4 Nd7 Rb7 Rxe4 Ra7 Rd6 Kf3 Rdxd4 cxd4 Rxd4
34   -0.68   01:43 981243K  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 Qe3 Rc8 a4 Rbc7 Rb5 Rc6 Rh8 Qf7 e5 Kd7 Rxb6 Rxb6 Bxb6 Qf5 Bxa5 Rc5 exd6 Qg5+ Kf2 Qxe3+ Kxe3 Rxa5 Rxf8 Rxa4 dxe7 Kxe7 Rb8
35   -0.58   02:19   1318M  Qc5+ Kg2 Nf8 Be3 Qc6 Bxc4+ Qxc4 Kg3 Kf7 g5 Qe6 Rd5 Rd8 Bd4 fxg5 Qxg5 Ke8 Qe3 Rc8 Bxb6 Qf6 Bxa5 Nd7 Bb4 Nb6 Rd4 Nc4 Qh6 Kd7 Qh3+ Qe6 a4 Ra7 a5 Ra6 Rd5 Qxh3+ Rxh3 Rca8 Rg5 Nxa5 Rh7 Nc6 Rxg6 Nxb4 cxb4 Ra4
36   -0.00   03:41   2097M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8
37   -0.00   04:21   2452M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8
38   -0.00   04:31   2544M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8 Re1 Qe5 Re3 Rbc7 Reh3 Qb5+ Kf2 Qc4 Qh8+ Kf7 e5 dxe5 Qh5+ Kg8 Kg1 Qxa2 Rg2 Qb3 Bxg5 fxg5 Qxg5+ Kf7 Qh5+ Kg8 Rf2 Rxc3 Qh8+ Kf7 Qh5+
39   -0.00   04:52   2743M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8
40   -0.00   05:24   3039M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kg2 Rc8 f5 g5 Qh3 Kf7 Qh5+ Kg8
41   -0.00   05:37   3171M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8 Re1 Qe5 Re3 Rbc7 Reh3 Qb5+ Kf2 Qc4 Ke1 Qxa2 Qh8+ Kf7 Qh5+
42   -0.00   06:05   3441M  Nf8 Bxc4+ Qxc4 f4 Qc5+ Kf1 Rc8 f5 g5 Qh8+ Kf7 Qh5+ Kg8

[Dann Corbit]

I do not think the answer is clear yet, but my guess is that Bg5 is actually better than Bg7:

[d]4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - acd 51; acs 900; bm Bg5; c3 "Bg7"; ce 343; id "ERET 084 - Koenigsangriff"; pm Bg5; pv Bg5 Nf8 Qh8+ Kf7 Rxd6 Qc5+ Kg2 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Rc6 Bxe2 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Rg2+ Kf3 Rg7 Qe4 Rg1 Qe3 Rd1 Qxc5+ Kf7 Qc4 Kf8 Qc7 a4 Qc4 Re7 Ke2 Rdd7 Qxa4 Ra7 Qb3 Ra6 a4 Kf7 Qc4 Ra5 Kf3 Rea7 Qd3 Re7 Qh7+ Kf8 Qh8+ Kf7 Ke3 Raa7 Qh7+ Kf8 Qe4 Kg7 Qc4 Rac7 Qb3 Ra7 Kd3 Ra6 Qc4 Ra5 Kc2;

[Vinvin]

I do not think the answer is clear yet, but my guess is that Bg5 is actually better than Bg7:

[d]4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - acd 51; acs 900; bm Bg5; c3 "Bg7"; ce 343; id "ERET 084 - Koenigsangriff"; pm Bg5; pv Bg5 Nf8 Qh8+ Kf7 Rxd6 Qc5+ Kg2 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Rc6 Bxe2 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Rg2+ Kf3 Rg7 Qe4 Rg1 Qe3 Rd1 Qxc5+ Kf7 Qc4 Kf8 Qc7 a4 Qc4 Re7 Ke2 Rdd7 Qxa4 Ra7 Qb3 Ra6 a4 Kf7 Qc4 Ra5 Kf3 Rea7 Qd3 Re7 Qh7+ Kf8 Qh8+ Kf7 Ke3 Raa7 Qh7+ Kf8 Qe4 Kg7 Qc4 Rac7 Qb3 Ra7 Kd3 Ra6 Qc4 Ra5 Kc2;

Bg5! is very strong ! Probably a new solution for this position.
How did you find it ?

[peter]

I do not think the answer is clear yet, but my guess is that Bg5 is actually better than Bg7:

[d]4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - acd 51; acs 900; bm Bg5; c3 "Bg7"; ce 343; id "ERET 084 - Koenigsangriff"; pm Bg5; pv Bg5 Nf8 Qh8+ Kf7 Rxd6 Qc5+ Kg2 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Rc6 Bxe2 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Rg2+ Kf3 Rg7 Qe4 Rg1 Qe3 Rd1 Qxc5+ Kf7 Qc4 Kf8 Qc7 a4 Qc4 Re7 Ke2 Rdd7 Qxa4 Ra7 Qb3 Ra6 a4 Kf7 Qc4 Ra5 Kf3 Rea7 Qd3 Re7 Qh7+ Kf8 Qh8+ Kf7 Ke3 Raa7 Qh7+ Kf8 Qe4 Kg7 Qc4 Rac7 Qb3 Ra7 Kd3 Ra6 Qc4 Ra5 Kc2;

Bg5! is very strong ! Probably a new solution for this position.

Indeed! What a long and yet rather forced line straight into endgame, which will take even longer then
but might be surely won too.

After Backward and 28.Bg5! :

[d]4r1k1/1r1np3/1pqp1pp1/p5B1/2b1P1PQ/2P2P2/P3B2R/3R2K1 b - - 0 1
Analysis by Cfish 041218 64 POP N:

28...Nf8 29.Rxd6 Qc5+ 30.Kg2 Kf7 31.Qh8 fxg5 32.Rh7+ Nxh7 33.Qxh7+ Kf8 34.Qh6+ Kf7 35.Qxg6+ Kf8 36.Qh6+ Kf7 37.Rc6 Bxe2 38.Qh7+ Kf8 39.Rxc5 bxc5 40.Qf5+ Kg7 41.Qxg5+ Kf8 42.Qf5+ Kg7 43.Qe5+ Kf8 44.Qh8+ Kf7 45.Qh5+ Kf8 46.e5 Rb2 47.Qh8+ Kf7 48.Qh7+ Kf8 49.Kg3 e6 50.f4 Bc4 51.f5 exf5 52.gxf5 Re7 53.Qh8+ Bg8 54.Qf6+ Ke8 55.Qc6+ Kd8 56.Qd6+ Ke8 57.e6 Rg7+ 58.Kf4 Bxe6 59.Qxe6+ Re7 60.Qg8+ Kd7 61.Qd5+ Ke8 62.Qxc5 Kf7 63.Qc4+ Kf6 64.Qd4+ Kf7 65.a4 Re1 66.Qd5+ Ke7 67.Qc5+ Kf7 68.Qc7+ Kf6 69.Qd6+ Kf7 70.Qg6+ Kf8 71.Qf6+ Kg8 72.Qg5+ Kf7 73.Qh5+ Kg8 74.Qg4+ Kf8 75.Qh4 Rbb1 76.Kg5 Rh1 77.Qe4 Kf7 78.Qd5+ Ke8 79.Qg8+ Kd7 80.Qe6+ Kd8 81.Qe3 Kd7 82.Qe5 Rbg1+ 83.Kf6 Rh6+ 84.Kf7 Rh7+ 85.Kf8
+- (3.67) Depth: 51/120 00:22:07 34934MN

[Dann Corbit]

I do not think the answer is clear yet, but my guess is that Bg5 is actually better than Bg7:

[d]4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - acd 51; acs 900; bm Bg5; c3 "Bg7"; ce 343; id "ERET 084 - Koenigsangriff"; pm Bg5; pv Bg5 Nf8 Qh8+ Kf7 Rxd6 Qc5+ Kg2 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Rc6 Bxe2 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Rg2+ Kf3 Rg7 Qe4 Rg1 Qe3 Rd1 Qxc5+ Kf7 Qc4 Kf8 Qc7 a4 Qc4 Re7 Ke2 Rdd7 Qxa4 Ra7 Qb3 Ra6 a4 Kf7 Qc4 Ra5 Kf3 Rea7 Qd3 Re7 Qh7+ Kf8 Qh8+ Kf7 Ke3 Raa7 Qh7+ Kf8 Qe4 Kg7 Qc4 Rac7 Qb3 Ra7 Kd3 Ra6 Qc4 Ra5 Kc2;

Bg5! is very strong ! Probably a new solution for this position.
How did you find it ?

No special cleverness on my part. When I find positions that are either unsolved or iffy, I put them into special collections. Then I have a bunch of machines analyze them with different engines. My best analysis goes into a table called Epd, but all the other analysis goes into a table called AlternateEvals. Every so often, I go through the alternate evals and find the positions that are interesting. When you posted about this position, I collected the best five alternative moves. Then, I took the base position and made the moves. Then I analyzed the positions after the moves were made, followed by the base position. The idea is to fill up the hash table with chocolatey goodness from the earlier analysis, sort of like hinting to what you want it to examine.

I have positions that have been analyzed thousands of times.