1600-rated engine draws latest Drawfish
Posted: Fri Jul 13, 2018 11:16 am
[pgn][Event "test"]
[Site "Dual X5670"]
[Date "2018.07.13"]
[Round "1"]
[White "Shallow Blue 1.1.0 64-bit"]
[Black "Stockfish 070718 64-bit"]
[Result "1/2-1/2"]
[ECO "A41"]
[GameDuration "00:10:35"]
[GameEndTime "2018-07-13T04:22:48.139 Eastern Daylight Time"]
[GameStartTime "2018-07-13T04:12:12.630 Eastern Daylight Time"]
[Opening "Old Indian"]
[PlyCount "31"]
[TimeControl "40/1260"]
[Variation "Tartakower (Wade) Variation"]
1. d4 {book} d6 {book} 2. Nf3 {book} Bg4 {book} 3. c4 {book} e5 {book}
4. dxe5 {book} Bxf3 {book} 5. exf3 {-0.11/8 32s} dxe5 {-0.45/29 67s}
6. Qb3 {+0.28/9 30s} Nc6 {0.00/24 8.2s} 7. Qxb7 {+0.83/8 32s} Nd4 {0.00/29 23s}
8. Bd3 {+1.19/8 32s} Nf6 {0.00/30 18s} 9. O-O {+1.29/7 32s} Be7 {0.00/31 47s}
10. Nc3 {+1.39/8 29s} Rb8 {0.00/33 13s} 11. Qxa7 {+1.70/8 32s} Ra8 {0.00/37 16s}
12. Qb7 {+0.09/8 33s} Rb8 {0.00/41 18s} 13. Qa6 {0.00/8 33s} Ra8 {0.00/42 32s}
14. Qb7 {0.00/9 25s} Rb8 {0.00/44 18s} 15. Qa6 {0.00/9 25s} Ra8 {0.00/45 15s}
16. Qb7 {0.00/9 25s, Draw by 3-fold repetition} 1/2-1/2
[/pgn]
Full game log on Pastebin: link -- includes all SF UCI options
Shallow Blue is a UCI engine by Rhys Rustad-Elliott, rated 1565 Elo on the CCRL blitz (cf SF9 at 3491 Elo). It's 1726 on the 40/40 list but that's based on a mere 50 games. A barebones single-threaded engine with no configurable options, using 24 MB of RAM. The game was run under CCRL 40/40 rules: default settings and for SF 512 MB hash, 5-men Syzygy TBs and the default contempt 21. Actual time control: 40/21 (this is what the Xeon X5670 benchmarks at).
[d]rn1qkbnr/ppp2ppp/3p4/4P3/2P5/5b2/PP2PPPP/RNBQKB1R w KQkq - 0 5
This is the book exit. SF evaluates it as +0.63 at d=44, but after 5.exf3 the eval goes down to +0.35 (same depth). So we can rule out this line as being bad for Black.
Actually, Shallow Blue is nothing special -- it's just the lowest-rated engine I had installed at the moment that is present on both of our lists. The result should be reproducible with lots of other sub-2000 engines; for example I tried Gargamella -- a 16-year old Xboard engine rated 1680 @40/4 that runs in 3MB of RAM -- and it made a still shorter draw (in 15 moves) at 40/4.
Yes, the default contempt and the emphasis on testing at hyper-bullet TCs do amazing wonders for Stockfish. In human terms, this would be like Magnus Carlsen walking into your local club, sitting down to play a 1000-rated guy and only managing a draw.
Full game log on Pastebin: link -- includes all SF UCI options
Shallow Blue is a UCI engine by Rhys Rustad-Elliott, rated 1565 Elo on the CCRL blitz (cf SF9 at 3491 Elo). It's 1726 on the 40/40 list but that's based on a mere 50 games. A barebones single-threaded engine with no configurable options, using 24 MB of RAM. The game was run under CCRL 40/40 rules: default settings and for SF 512 MB hash, 5-men Syzygy TBs and the default contempt 21. Actual time control: 40/21 (this is what the Xeon X5670 benchmarks at).
[d]rn1qkbnr/ppp2ppp/3p4/4P3/2P5/5b2/PP2PPPP/RNBQKB1R w KQkq - 0 5
This is the book exit. SF evaluates it as +0.63 at d=44, but after 5.exf3 the eval goes down to +0.35 (same depth). So we can rule out this line as being bad for Black.
Actually, Shallow Blue is nothing special -- it's just the lowest-rated engine I had installed at the moment that is present on both of our lists. The result should be reproducible with lots of other sub-2000 engines; for example I tried Gargamella -- a 16-year old Xboard engine rated 1680 @40/4 that runs in 3MB of RAM -- and it made a still shorter draw (in 15 moves) at 40/4.
Yes, the default contempt and the emphasis on testing at hyper-bullet TCs do amazing wonders for Stockfish. In human terms, this would be like Magnus Carlsen walking into your local club, sitting down to play a 1000-rated guy and only managing a draw.