I have just released Amoeba version 2.7.
You can download binary for windows (x86 & x64) or linux (x64) here:
https://github.com/abulmo/amoeba/releases/tag/v2.7
I expect an elo increase around 40 over Amoeba 2.6
I hope you will enjoy it.
Amoeba 2.7
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Amoeba 2.7
Richard Delorme
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Re: Amoeba 2.7
Thank you, Richard.
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Re: Amoeba 2.7
Richard, thx
Below is Amoeba2.7 macOS executable compiled with ldc2:
https://www.dropbox.com/s/g6aol1036jawb ... r.zip?dl=0
Below is Amoeba2.7 macOS executable compiled with ldc2:
https://www.dropbox.com/s/g6aol1036jawb ... r.zip?dl=0
Regards, Darius
https://chessengeria.eu
https://chessengeria.eu
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Re: Amoeba 2.7
A position Amoeba has some trouble to analyze:
[d] r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46
Hope this helps to improve the engine.
[d] r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46
Hope this helps to improve the engine.
Nothing is unstable (Lawrence Krauss)
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Re: Amoeba 2.7
Not using an engine here, but wouldn't you just play 1.Qxa8 Qxa8 2.Rb8 Qc6 3. Bb5 +-?Maarten Claessens wrote:A position Amoeba has some trouble to analyze:
[d] r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46
Hope this helps to improve the engine.
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Re: Amoeba 2.7
Indeed but look at this (Amoeba with 512 Mb hash):
Up to ply 23 the engine wants to play Rb8?? and then needs quite some time to find the right move.
Code: Select all
FEN: r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46
Amoeba 2.7:
1/7 00:00 201 801,435 +2.64 Rb2b8
2/9 00:00 330 892,615 +2.62 Rb2b8 d5d4+ Kf3f2
3/11 00:00 761 1,133,621 +7.69 Rb2b8 Qc6xc7 Qa3xa8
4/8 00:00 1,092 1,283,347 +7.90 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Qa3xa8
5/11 00:00 3,205 1,654,108 +8.60 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1
6/18 00:00 4,619 1,903,015 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2
7/15 00:00 5,486 1,902,878 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 Qg3xf4+ Kd2c2
8/15 00:00 7,056 1,943,908 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Kf2f3 Qh2h3+ Kf3f2
9/18 00:00 17,330 2,058,585 +9.77 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1
10/21 00:00 53,332 2,008,919 +12.21 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4h2+ Kf2f1 Ne7c8 Nd6xe8 Kf8xe8
11/22 00:00 97,009 2,172,907 +13.96 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 Ne7c8 Rb8xc8 Qd2c1+ Kf1f2 Qc1e3+
12/27 00:00 153,787 2,274,262 +13.15 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8f6+ Kf8g7 Qa3xe7 Qc3d2+ Bd3e2 Qd2xf4+ Kf2g1 Qf4xe5
13/29 00:00 326,541 2,248,299 +17.28 Rb2b8 g7g5 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5
14/19 00:00 368,552 2,288,362 +15.83 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Rb8xa8 g7g6 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1
15/27 00:00 464,798 2,400,271 +16.52 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g1+ Ke1d2
16/23 00:00 522,622 2,428,835 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1
17/30 00:00 572,354 2,442,393 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 Qh3g3+ Kg1f1
18/33 00:00 1,287,748 2,365,205 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7
19/31 00:00 1,406,907 2,368,794 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4
20/42 00:00 2,027,578 2,380,571 +19.57 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 Kg7h6
21/36 00:01 4,284,451 2,399,749 +21.71 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6xc6 g5xf4 Qc6xd5 Kg7f8 Kf3xf4 Kf8g7
22/36 00:02 6,614,278 2,441,230 +23.56 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8e7 Qh6xc6 g5xf4 Qc6xd5 Ke7f8 Kf3xf4
23/34 00:02 7,063,758 2,456,902 +22.76 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8f7 Qh6g6+ Kf7f8 Qg6h6+ Kf8f7 Qh6g6+ Kf7f8 Qg6f6+ Kf8g8 Qf6xc6 g5xf4
24/74 06:00 1,065,652,781 2,956,577 +3.89 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8h7 Kf3e3 e6e5 Bc8f5+ Kh7g8 Bf5c8 Kg8f8
25/52 06:01 1,068,141,281 2,954,203 +4.18 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8b7 Kf8e8 Kf3f4 Ke8d8 Kf4e5 Kd8d7
26/68 06:02 1,070,062,752 2,952,790 +4.29 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8d7 Kf8g8 Kf3e3 Kg8f8 Ke3d4 Kf8g8 Bd7c8 Kg8h7 Bc8b7
27/47 06:03 1,073,212,971 2,950,300 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7
28/58 06:05 1,076,301,050 2,948,129 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7
29/58 06:06 1,080,262,656 2,946,653 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7
Nothing is unstable (Lawrence Krauss)
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Re: Amoeba 2.7
Very strange indeed.Maarten Claessens wrote:Indeed but look at this (Amoeba with 512 Mb hash):Up to ply 23 the engine wants to play Rb8?? and then needs quite some time to find the right move.Code: Select all
FEN: r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46 Amoeba 2.7: 1/7 00:00 201 801,435 +2.64 Rb2b8 2/9 00:00 330 892,615 +2.62 Rb2b8 d5d4+ Kf3f2 3/11 00:00 761 1,133,621 +7.69 Rb2b8 Qc6xc7 Qa3xa8 4/8 00:00 1,092 1,283,347 +7.90 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Qa3xa8 5/11 00:00 3,205 1,654,108 +8.60 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 6/18 00:00 4,619 1,903,015 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 7/15 00:00 5,486 1,902,878 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 Qg3xf4+ Kd2c2 8/15 00:00 7,056 1,943,908 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Kf2f3 Qh2h3+ Kf3f2 9/18 00:00 17,330 2,058,585 +9.77 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 10/21 00:00 53,332 2,008,919 +12.21 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4h2+ Kf2f1 Ne7c8 Nd6xe8 Kf8xe8 11/22 00:00 97,009 2,172,907 +13.96 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 Ne7c8 Rb8xc8 Qd2c1+ Kf1f2 Qc1e3+ 12/27 00:00 153,787 2,274,262 +13.15 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8f6+ Kf8g7 Qa3xe7 Qc3d2+ Bd3e2 Qd2xf4+ Kf2g1 Qf4xe5 13/29 00:00 326,541 2,248,299 +17.28 Rb2b8 g7g5 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 14/19 00:00 368,552 2,288,362 +15.83 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Rb8xa8 g7g6 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 15/27 00:00 464,798 2,400,271 +16.52 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g1+ Ke1d2 16/23 00:00 522,622 2,428,835 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 17/30 00:00 572,354 2,442,393 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 Qh3g3+ Kg1f1 18/33 00:00 1,287,748 2,365,205 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 19/31 00:00 1,406,907 2,368,794 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 20/42 00:00 2,027,578 2,380,571 +19.57 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 Kg7h6 21/36 00:01 4,284,451 2,399,749 +21.71 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6xc6 g5xf4 Qc6xd5 Kg7f8 Kf3xf4 Kf8g7 22/36 00:02 6,614,278 2,441,230 +23.56 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8e7 Qh6xc6 g5xf4 Qc6xd5 Ke7f8 Kf3xf4 23/34 00:02 7,063,758 2,456,902 +22.76 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8f7 Qh6g6+ Kf7f8 Qg6h6+ Kf8f7 Qh6g6+ Kf7f8 Qg6f6+ Kf8g8 Qf6xc6 g5xf4 24/74 06:00 1,065,652,781 2,956,577 +3.89 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8h7 Kf3e3 e6e5 Bc8f5+ Kh7g8 Bf5c8 Kg8f8 25/52 06:01 1,068,141,281 2,954,203 +4.18 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8b7 Kf8e8 Kf3f4 Ke8d8 Kf4e5 Kd8d7 26/68 06:02 1,070,062,752 2,952,790 +4.29 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8d7 Kf8g8 Kf3e3 Kg8f8 Ke3d4 Kf8g8 Bd7c8 Kg8h7 Bc8b7 27/47 06:03 1,073,212,971 2,950,300 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 28/58 06:05 1,076,301,050 2,948,129 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7 29/58 06:06 1,080,262,656 2,946,653 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7
I found the line up to 3.Bb5 in about 4 seconds.
Humans have nice pruning.
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Re: Amoeba 2.7
Well, 3. Bb5 is not the best move as that allows 3. ... Qc3+ with a perpetual check. 3. Rxe8+ is much stronger.BrendanJNorman wrote:Very strange indeed.Maarten Claessens wrote:Indeed but look at this (Amoeba with 512 Mb hash):Up to ply 23 the engine wants to play Rb8?? and then needs quite some time to find the right move.Code: Select all
FEN: r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46 Amoeba 2.7: 1/7 00:00 201 801,435 +2.64 Rb2b8 2/9 00:00 330 892,615 +2.62 Rb2b8 d5d4+ Kf3f2 3/11 00:00 761 1,133,621 +7.69 Rb2b8 Qc6xc7 Qa3xa8 4/8 00:00 1,092 1,283,347 +7.90 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Qa3xa8 5/11 00:00 3,205 1,654,108 +8.60 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 6/18 00:00 4,619 1,903,015 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 7/15 00:00 5,486 1,902,878 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 Qg3xf4+ Kd2c2 8/15 00:00 7,056 1,943,908 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Kf2f3 Qh2h3+ Kf3f2 9/18 00:00 17,330 2,058,585 +9.77 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 10/21 00:00 53,332 2,008,919 +12.21 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4h2+ Kf2f1 Ne7c8 Nd6xe8 Kf8xe8 11/22 00:00 97,009 2,172,907 +13.96 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 Ne7c8 Rb8xc8 Qd2c1+ Kf1f2 Qc1e3+ 12/27 00:00 153,787 2,274,262 +13.15 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8f6+ Kf8g7 Qa3xe7 Qc3d2+ Bd3e2 Qd2xf4+ Kf2g1 Qf4xe5 13/29 00:00 326,541 2,248,299 +17.28 Rb2b8 g7g5 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 14/19 00:00 368,552 2,288,362 +15.83 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Rb8xa8 g7g6 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 15/27 00:00 464,798 2,400,271 +16.52 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g1+ Ke1d2 16/23 00:00 522,622 2,428,835 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 17/30 00:00 572,354 2,442,393 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 Qh3g3+ Kg1f1 18/33 00:00 1,287,748 2,365,205 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 19/31 00:00 1,406,907 2,368,794 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 20/42 00:00 2,027,578 2,380,571 +19.57 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 Kg7h6 21/36 00:01 4,284,451 2,399,749 +21.71 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6xc6 g5xf4 Qc6xd5 Kg7f8 Kf3xf4 Kf8g7 22/36 00:02 6,614,278 2,441,230 +23.56 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8e7 Qh6xc6 g5xf4 Qc6xd5 Ke7f8 Kf3xf4 23/34 00:02 7,063,758 2,456,902 +22.76 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8f7 Qh6g6+ Kf7f8 Qg6h6+ Kf8f7 Qh6g6+ Kf7f8 Qg6f6+ Kf8g8 Qf6xc6 g5xf4 24/74 06:00 1,065,652,781 2,956,577 +3.89 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8h7 Kf3e3 e6e5 Bc8f5+ Kh7g8 Bf5c8 Kg8f8 25/52 06:01 1,068,141,281 2,954,203 +4.18 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8b7 Kf8e8 Kf3f4 Ke8d8 Kf4e5 Kd8d7 26/68 06:02 1,070,062,752 2,952,790 +4.29 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8d7 Kf8g8 Kf3e3 Kg8f8 Ke3d4 Kf8g8 Bd7c8 Kg8h7 Bc8b7 27/47 06:03 1,073,212,971 2,950,300 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 28/58 06:05 1,076,301,050 2,948,129 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7 29/58 06:06 1,080,262,656 2,946,653 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7
I found the line up to 3.Bb5 in about 4 seconds.
Humans have nice pruning.
I applaud your ability to spot the first couple of moves in a mere 4 seconds though! That is impressive to me as within the first 5 seconds, I'm still taking stock of the position on the board and haven't even started to look at possible moves!
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- Posts: 2526
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- Full name: Brendan J Norman
Re: Amoeba 2.7
Thanks.royb wrote:Well, 3. Bb5 is not the best move as that allows 3. ... Qc3+ with a perpetual check. 3. Rxe8+ is much stronger.BrendanJNorman wrote:Very strange indeed.Maarten Claessens wrote:Indeed but look at this (Amoeba with 512 Mb hash):Up to ply 23 the engine wants to play Rb8?? and then needs quite some time to find the right move.Code: Select all
FEN: r3bk2/2P1npp1/2qNp2p/3pP2P/5PP1/Q2B1K2/1R6/8 w - - 5 46 Amoeba 2.7: 1/7 00:00 201 801,435 +2.64 Rb2b8 2/9 00:00 330 892,615 +2.62 Rb2b8 d5d4+ Kf3f2 3/11 00:00 761 1,133,621 +7.69 Rb2b8 Qc6xc7 Qa3xa8 4/8 00:00 1,092 1,283,347 +7.90 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Qa3xa8 5/11 00:00 3,205 1,654,108 +8.60 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 6/18 00:00 4,619 1,903,015 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 7/15 00:00 5,486 1,902,878 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2e1 Qh2g3+ Ke1d2 Qg3xf4+ Kd2c2 8/15 00:00 7,056 1,943,908 +9.50 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Kf2f3 Qh2h3+ Kf3f2 9/18 00:00 17,330 2,058,585 +9.77 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Kf2f3 Qh2h3+ Kf3f2 Qh3h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 10/21 00:00 53,332 2,008,919 +12.21 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4h2+ Kf2f1 Ne7c8 Nd6xe8 Kf8xe8 11/22 00:00 97,009 2,172,907 +13.96 Rb2b8 d5d4+ Kf3f2 Qc6h1 Qa3xa8 Qh1h2+ Qa8g2 Qh2xf4+ Qg2f3 Qf4d2+ Kf2f1 Ne7c8 Rb8xc8 Qd2c1+ Kf1f2 Qc1e3+ 12/27 00:00 153,787 2,274,262 +13.15 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8f6+ Kf8g7 Qa3xe7 Qc3d2+ Bd3e2 Qd2xf4+ Kf2g1 Qf4xe5 13/29 00:00 326,541 2,248,299 +17.28 Rb2b8 g7g5 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 14/19 00:00 368,552 2,288,362 +15.83 Rb2b8 d5d4+ Kf3f2 Qc6xc7 Rb8xa8 g7g6 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 15/27 00:00 464,798 2,400,271 +16.52 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g1+ Ke1d2 16/23 00:00 522,622 2,428,835 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 17/30 00:00 572,354 2,442,393 +16.54 Rb2b8 g7g6 Rb8xa8 d5d4+ Kf3f2 Qc6xc7 Nd6xe8 Qc7c3 Ne8c7+ Kf8g7 Nc7xe6+ Kg7h7 Qa3xe7 Qc3d2+ Bd3e2 Qd2e3+ Kf2e1 Qe3g3+ Ke1f1 Qg3h3+ Kf1g1 Qh3g3+ Kg1f1 18/33 00:00 1,287,748 2,365,205 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 19/31 00:00 1,406,907 2,368,794 +19.39 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 20/42 00:00 2,027,578 2,380,571 +19.57 Rb2b8 d5d4+ Kf3f2 g7g5 Rb8xa8 Qc6xc7 Ra8xe8+ Kf8g7 Re8xe7 Qc7xe7 Nd6f5+ e6xf5 Qa3xe7 f5xg4 f4xg5 g4g3+ Kf2xg3 h6xg5 Qe7xg5+ Kg7f8 Qg5d8+ Kf8g7 Qd8xd4 Kg7h6 21/36 00:01 4,284,451 2,399,749 +21.71 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6xc6 g5xf4 Qc6xd5 Kg7f8 Kf3xf4 Kf8g7 22/36 00:02 6,614,278 2,441,230 +23.56 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8e7 Qh6xc6 g5xf4 Qc6xd5 Ke7f8 Kf3xf4 23/34 00:02 7,063,758 2,456,902 +22.76 Rb2b8 g7g5 Rb8xa8 Qc6xc7 Nd6xe8 Qc7c6 Ne8c7+ Qc6xa8 Qa3xa8+ Kf8g7 Qa8d8 Ne7c6 Nc7xe6+ f7xe6 Qd8f6+ Kg7g8 Qf6xe6+ Kg8g7 Qe6g6+ Kg7f8 Qg6xh6+ Kf8f7 Qh6g6+ Kf7f8 Qg6h6+ Kf8f7 Qh6g6+ Kf7f8 Qg6f6+ Kf8g8 Qf6xc6 g5xf4 24/74 06:00 1,065,652,781 2,956,577 +3.89 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8h7 Kf3e3 e6e5 Bc8f5+ Kh7g8 Bf5c8 Kg8f8 25/52 06:01 1,068,141,281 2,954,203 +4.18 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 g7xf6 e5xf6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8b7 Kf8e8 Kf3f4 Ke8d8 Kf4e5 Kd8d7 26/68 06:02 1,070,062,752 2,952,790 +4.29 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 Kf8g8 f5f6 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 Kg8f8 Bc8d7 Kf8g8 Kf3e3 Kg8f8 Ke3d4 Kf8g8 Bd7c8 Kg8h7 Bc8b7 27/47 06:03 1,073,212,971 2,950,300 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 28/58 06:05 1,076,301,050 2,948,129 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7 29/58 06:06 1,080,262,656 2,946,653 +4.88 Qa3xa8 Qc6xa8 Rb2b8 Qa8a4 Rb8xe8+ Qa4xe8 Nd6xe8 Kf8xe8 Bd3b5+ Ke8f8 f4f5 e6xf5 g4xf5 Ne7c8 Bb5d7 Nc8b6 c7c8Q+ Nb6xc8 Bd7xc8 g7g6 h5xg6 f7xg6 f5xg6 Kf8g7 Bc8f5 h6h5 e5e6 Kg7f6 e6e7 Kf6xe7 g6g7
I found the line up to 3.Bb5 in about 4 seconds.
Humans have nice pruning.
I applaud your ability to spot the first couple of moves in a mere 4 seconds though! That is impressive to me as within the first 5 seconds, I'm still taking stock of the position on the board and haven't even started to look at possible moves!
Tactical themes seem to jump out at me with a quick scan at this stage, but I need to look longer to examine move-orders and examine followups (like ...Qc3 in this case).
I'm sure I'd have quickly spotted ...Qc3 with perpy with a few more seconds thought though.
Swapping everything and just Ba6 is easy as pie, but I tend to try to be clever (I'm driven by aesthetics more than winning haha), and then "refute" myself with deeper thought later.