a stupid analysis by stockfish at multi-pv

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Uri Blass
Posts: 11223
Joined: Thu Mar 09, 2006 12:37 am
Location: Tel-Aviv Israel

a stupid analysis by stockfish at multi-pv

Post by Uri Blass »

I use stockfish with multi-pv with 2 options:
line a starts
11.f4 h6 12.g4 when line b starts
11.g4 h6 12.f4

I t is logical n this case the engine is going prune line B at 12.f4 assuming the same score because the position is clearly the same even if you consider future repetition and fifty move rule but for some reason it is not the case and the engine gives a different score for 11.f4 and 11.g4 at the same iteration and also the pv is different after the same position repeat.

I woinder what is the stronget chess engine without this analysis bug.

Edit:You may claim that one of them is practically better because maybe the opponent is not going to play the pv move but I know stockfish like other alpha beta engines do not calculate in that way.

Here is the analysis at iterations 40-42
[d]r1b2rk1/1pqnbppp/p2ppn2/8/2PNP3/2N1B3/PP2BPPP/2RQ1RK1 w - - 6 11

Stockfish19052026l:

40/66 07:53 1,128,270k 2,381k +1.33 g2-g4 h7-h6 f2-f4 Qc7-d8 Rc1-c2 Nf6-h7 Rc2-d2 Be7-f6 Qd1-e1 Bf6-h4 Be3-f2 Bh4-f6 h2-h4 e6-e5 Nd4-f5 e5xf4 Rd2xd6 Bf6-e5 Rd6-d3 Rf8-e8 Qe1-d2 Nh7-f6 Bf2-d4 Qd8-a5 Rf1xf4 Qa5-c7 Rd3-f3 Be5xd4+ Nf5xd4 b7-b5 g4-g5 h6xg5 h4xg5 b5-b4 Nc3-d5 Nf6xd5 c4xd5 Nd7-e5 Rf3-f2 Bc8-d7 Be2-h5 g7-g6 Bh5-e2 Ra8-c8 Be2-d1
40/74 07:53 1,128,270k 2,381k +1.35 f2-f4 h7-h6 g2-g4 Qc7-d8 Rc1-c2 Nf6-h7 Rc2-d2 Ra8-b8 a2-a3 Rf8-e8 b2-b4 Be7-f6 Qd1-c2 Qd8-c7 Rf1-d1 Nh7-f8 Nd4-b5 a6xb5 Nc3xb5 Qc7-d8 Nb5xd6 Bf6-e7 Nd6xe8 Qd8xe8 c4-c5 Rb8-a8 a3-a4 Nd7-f6 b4-b5 Nf8-g6 h2-h3 e6-e5 f4-f5 Ng6-f4 Be3xf4 e5xf4
---------------------------------------------------------------------------
41/76 08:32 1,209,335k 2,361k +1.25 g2-g4 h7-h6 f2-f4 Qc7-d8 Rc1-c2 Nf6-h7 Rc2-d2 Be7-f6 Qd1-e1 Bf6-h4 Qe1-c1 Bh4-e7 a2-a3 Rf8-e8 Nd4-f3 b7-b6 Qc1-e1 Bc8-b7 Qe1-g3 Be7-f6 Rd2xd6 Bf6xc3 b2xc3 Qd8-c7 e4-e5 Nd7-c5 Nf3-d2 Ra8-d8 Rd6xd8 Qc7xd8 Be3-d4 f7-f6 Qg3-e3 f6-f5 g4xf5 e6xf5 Be2-f3 Bb7-a8 Bf3xa8 Qd8xa8 Nd2-f3 Nh7-f8 Nf3-h4 g7-g6 Bd4xc5 b6xc5 Rf1-d1 Qa8-b7 Qe3xc5 Nf8-e6 Qc5-d5 Qb7-f7
41/66 08:32 1,209,335k 2,361k +1.29 f2-f4 h7-h6 g2-g4 Qc7-d8 Rc1-c2 Nf6-h7 Rc2-d2 Be7-f6 Qd1-e1 Bf6-h4 Be3-f2 Bh4-f6 h2-h4 e6-e5 Nd4-f5 e5xf4 Rd2xd6 Bf6-e5 Rd6-d3 Qd8-e8 Qe1-d2 Nd7-f6 Be2-f3 Be5xc3 Qd2xc3 Bc8xf5 e4xf5 Nf6-e4 Qc3-e1 Ne4xf2 Qe1xe8 Nf2-h3+ Kg1-h2 Ra8xe8 Kh2xh3 Re8-e7 Rf1-d1 g7-g5 f5xg6/ep f7xg6 Rd3-b3 Nh7-f6 Bf3xb7 Nf6-d7 Bb7-f3 Nd7-c5 Rb3-b6 Re7-e3 Kh3-g2 Nc5-d3 Rb6xg6+ Kg8-h7
---------------------------------------------------------------------------
42/72 11:32 1,589,788k 2,296k +1.32 g2-g4 h7-h6 f2-f4 Nf6-h7 Qd1-e1 g7-g5 Qe1-g3 b7-b6 h2-h4 g5xh4 Qg3-h3 Kg8-h8 Kg1-f2 Bc8-b7 Rf1-h1 Rf8-g8 Rc1-g1 Nd7-c5 g4-g5 Rg8-g6 Rg1-g4 Nc5xe4+ Nc3xe4 Bb7xe4 Be2-f3 Be4xf3 Qh3xf3 Ra8-g8 Rg4xh4 Be7-f8 b2-b3 Qc7-d7 Qf3-e4 b6-b5 f4-f5 Rg6xg5 Be3xg5 Nh7xg5 Qe4-f4 Qd7-d8 f5xe6 Rg8-g6 Nd4-f5 Qd8-f6 e6-e7 Qf6-b2+ Kf2-f1
42/71 11:32 1,589,788k 2,296k +1.33 f2-f4 h7-h6 g2-g4 Qc7-d8 Rc1-c2 Nf6-h7 Rc2-d2 Be7-f6 Qd1-e1 Bf6-h4 Qe1-c1 Bh4-e7 a2-a3 Rf8-e8 Nd4-f3 Qd8-c7 h2-h4 b7-b6 g4-g5 Bc8-b7 Be2-d3 h6-h5 Qc1-e1 Be7-f8 g5-g6 f7xg6 Qe1-g3 Bf8-e7 Qg3xg6 Nh7-f8 Qg6-g3 Be7-f6 Nf3-g5 Re8-e7 Bd3-e2 Nd7-c5 Be3xc5 Qc7xc5+ Kg1-h2 Ra8-c8 Rf1-f2 Bf6-d4
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Dicaste
Posts: 156
Joined: Mon Apr 16, 2012 7:23 pm
Location: Istanbul, TURKEY

Re: a stupid analysis by stockfish at multi-pv

Post by Dicaste »

I have an engine which uses Lc0 DAG + NNUE it has same problem too.

g4 +1.37
f4 +1.33

Code: Select all

New game Line 0.0
r1b2rk1/1pqnbppp/p2ppn2/8/2PNP3/2N1B3/PP2BPPP/2RQ1RK1 w - - 0 1

Analysis by Samaritan 0.6 x64:

11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/31   00:00:00  342kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/37   00:00:00  342kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/37   00:00:01  342kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/37   00:00:01  342kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/37   00:00:01  342kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 17/46   00:00:01  343kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.36)  Depth: 18/47   00:00:01  343kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.36)  Depth: 19/47   00:00:01  343kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.36)  Depth: 19/48   00:00:02  344kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.36)  Depth: 19/48   00:00:05  349kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.36)  Depth: 19/48   00:00:05  349kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 19/49   00:00:08  355kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 19/50   00:00:08  355kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 19/51   00:00:09  356kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 19/51   00:00:14  365kN
11.g4 h6 12.f4 Nh7 13.Qe1 b6 14.Qg3 g5 15.Nf3 Bb7 16.h4 gxh4 17.Nxh4 Bf6 18.Nf3 Bxc3 19.Rxc3 Nc5 20.Nd2 f6 21.Rf2 Nxe4 22.Nxe4 Bxe4 23.Rh2 Qg7 24.Bd2 b5 25.Qf2 e5 26.Rch3 exf4 27.Rxh6 Qa7 28.Bxf4 Qxf2+ 29.Kxf2 bxc4 30.Bxd6 Rfd8 31.Bb4 Kg7 32.Bc3 Bg6 33.Bf3 Ng5 34.Bxa8 Rxa8 35.Rh1 Rd8 
  White is clearly better: +/- (1.37)  Depth: 19/51   00:00:19  373kN

(,  22.05.2026)
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