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The machine Kotov used for development was an IBM 7090, first released in 1960. It was the transistorized revision of the earlier and quite popular IBM 709, a vacuum tube machine. Computer time on a 7090 was available at the rate of about US$100 per hour. A picture: http://www.cozx.com/~dpitts/pix/...

Hi Bob I am intrigued now, lets have another peek at what is going on with Crafty on my setup. (Single CPU P4, WinXp, Chess Arena 1.1) I know the later Chess Arena betas, have fen bugs, but as far as I am aware 1.1 is OK. I forget which version of Crafty I originally tried so I downloaded it again....

A single core-2 processor (just one CPU) is more than twice as fast as a single PIV 2.8ghz xeon. My office machine using both cpus hits 1.5-2.0M nps. My 2.0ghz core-2 laptop hits 5-6M nps. the comparison is startling... Note that the xeon box in my office is 32 bit, while my core-2 is 64 bit and I'...

Well, as the e.p. square here is only used to decide if the following move is legal, and not for determining if positions are different for hashing or applying the 3-rep rule, it is not a bug to consider that e.p. rights exist when no Pawn is present to enjoy these rights... Yes, precisely. Note it...

Well, as the e.p. square here is only used to decide if the following move is legal, and not for determining if positions are different for hashing or applying the 3-rep rule, it is not a bug to consider that e.p. rights exist when no Pawn is present to enjoy these rights... It's maybe not a "bug",...

I do not understand the bug There was no enpassent capture possible in the end of the first game so I do not see how clearing enpassent square between games could be relevant. There was no black pawn at b4 in the final position of the game. Uri some programs incorrectly (IMHO) set an EP target when...

I have tried again with the same commands posted above and obtained the same result you posted (i.e. correct mate found)... who knows what I did when I tried that for the first time! :shock: OK. To the best of my knowledge I haven't had an EP bug in many years. Except for the cases where a GUI fail...

For those kinds of endings, I don't think you even need 'em. KQKR is more difficult than either of those, and a simple "drive the king to the edge/corner and keep the kings close together is more than enough to force the win with kqkr. With kqkb or kqkn it is even easier...

In RomiChess the piece/square tables are created dynamically before each search. This can lead to some extreamly unbalanced evals leading to things like bad sacrifices and other pathalogical behaviors. So, what is best, limiting each square to a maximum or adding up all the squares and scaling them...

you need to figure out why Crafty failed the test, when it works perfectly for any version I tried... There is definitely an interface or operator issue involved here. At the time I did a quick test with Crafty on Mac OS X (it was version 19.13 IIRC, downloaded with Fink), just open a terminal, run...