SF19 gets stuck at depth 11
Author: robertnurnbergCreated Sep 10, 2026Updated Sep 13, 2026
Describe the issue
First reported by @noobpwnftw on discord, as this affects his workers on chessdb.cn.
Expected behavior
Reach depth 12 in finite time.
Steps to reproduce
setoption name MultiPV value 256
position fen 1r3rk1/p5bp/1n1p1Qp1/8/2P5/2NB3b/PP2RP2/R1B3K1 b - -
go depth 12
position fen 1rb2rk1/p1p2p1p/2p3p1/4P2P/5P2/2P2P2/P7/3RKB1R b K -
go depth 12
position fen r1b2rk1/1p3ppp/2n2n2/p3p2q/8/R2P1NP1/3NPPBP/Q4RK1 b - -
go depth 12
position fen 2r5/5pk1/1p1Q2p1/p7/n2Rp1N1/1P2Pq1P/5P2/6K1 w - -
go depth 12Anything else?
Last output on console is
info depth 11 seldepth 7 multipv 35 score mate -3 nodes 14224488 nps 1444550 hashfull 991 tbhits 0 time 9847 pv d4b4 c8c1 d6d1 f3d1 g1g2 d1g1
info depth 11 seldepth 5 multipv 36 score mate -2 nodes 14224488 nps 1444550 hashfull 991 tbhits 0 time 9847 pv d6h2 c8c1 d4d1 c1d1
info depth 12 currmove g4e5 currmovenumber 20
info depth 12 currmove d4a4 currmovenumber 21
info depth 12 currmove d6b6 currmovenumber 22
info depth 12 currmove d4e4 currmovenumber 23
info depth 12 currmove g1f1 currmovenumber 24
info depth 12 currmove d6e7 currmovenumber 25
info depth 12 currmove b3b4 currmovenumber 26Then engine does not report anything for a very long time, while at 100% cpu.
Operating system
All
Stockfish version
Stockfish 19
Source: official-stockfish/Stockfish