I played some more matches with Ktulu 9.0 inside ert using a homemade short book (8moves) instead of starting-positions (top25.pgn from Sedat). The results look better now - especially against Deep Sjeng 2.7:
results:
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1 Ktulu 9.0 +22/-10/=19 61.76% 31.5/51 2851 much better!
2 Deep Sjeng 2.7 1CPU +10/-22/=19 38.24% 19.5/51Code: Select all
1 Grapefruit 1.0 +24/-10/=21 62.73% 34.5/55
2 Ktulu 9.0 +10/-24/=21 37.27% 20.5/55 2768 :-(Code: Select all
1 Stockfish 1.3 x64 1CPU +22/-21/=14 50.88% 29.0/57
2 Ktulu 9.0 +21/-22/=14 49.12% 28.0/57 2867!