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Subject: Is this an engine bug in Chessmaster 8000?

Author: Steve Maughan

Date: 02:53:31 11/25/00

I came across this position when analysing with CM 8000.

[d] rnb3kr/ppp3bp/3pq3/3N3Q/5R2/8/PPP3PP/R5K1 w - - 0 18

CM 8000’s search behaviour is ‘different’ and could be a bug.  At first
ChessMaster thinks Nxc7+ is the best move with a score of –1.19.  Then at ply 7
this increase to +0.65.  Everything is OK so far.  Then at the same ply the PV
changes to Raf1 with a score of +0.00.  This implies that CM would prefer a move
of +0.00 over a move of +0.65 (the fact that Raf1 is probably a better move is
an aside). Now there could be a sensible explanantion e.g. CM could be fibbing
when it comes to its PV.

Does anyone have an idea what is going on?

Regards,

Steve Maughan

• Re: Is this an engine bug in Chessmaster 8000? Stefan Fredriksson 02:57:58 11/25/00
  • Re: Is this an engine bug in Chessmaster 8000? Laurence Chen 06:41:32 11/25/00
    • Re: Is this an engine bug in Chessmaster 8000? Steve Maughan 08:58:47 11/25/00
  • Re: Is this an engine bug in Chessmaster 8000? Steve Maughan 05:50:25 11/25/00
    • Re: Is this an engine bug in Chessmaster 8000? John Merlino 10:02:36 11/25/00
      • Re: Is this an engine bug in Chessmaster 8000? Steve Maughan 11:18:30 11/25/00

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