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Subject: Re: Why squish epd anyway?

Author: KarinsDad

Date: 22:54:47 05/18/99

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Dann,

Here is the Shirov Kasparov game I mentioned. I just picked a random game. As
can be seen, this game maxed out at 142 bits (if Shirov would have castled, say
at move 13, it could have been 150 bits or slightly higher). The two numbers on
the left are the number of bits required after each move. The entire advantage
of this schema is that most black pieces do not require a color bit until a
white piece or pawn is taken. Once this happens, (in this game at move 3 since
it was a Sicilian), that condition no longer holds. However, only 2 pawns or one
piece have to be taken in the entire game to basically ensure that 160 bits is
the maximum, so by move 4 in this game, the chances of it going above 160 bits
are negligible.

It would be interesting if someone could find a position from a real game that
could get to 161 bits or more, but I doubt that will happen.

KarinsDad :)

125 125  1.e4 c5
126 126  2.Nf3 d6
126 137  3.d4 cxd4
135 136  4.Nxd4 Nf6
137 137  5.Nc3 a6
139 139  6.Be3 Ng4
139 139  7.Bg5 h6
139 139  8.Bh4 g5
139 140  9.Bg3 Bg7
141 141 10.Be2 h5
137 133 11.Bxg4 hxg4
141 142 12.0-0 Nc6
142 138 13.Nf5 Bxc3
134 135 14.bxc3 Qa5
134 134 15.Qxg4 f6
134 132 16.Rab1 Qxc3
132 132 17.Rfd1 Ne5
128 124 18.Bxe5 Qxe5
124 124 19.g3 b5
124 122 20.c4 bxc4
122 122 21.Qf3 c3
122 123 22.Rbc1 Bb7
121 119 23.Qxc3 Bxe4
117 113 24.Nxd6+ exd6
113 109 25.Re1 Qxc3
106 106 26.Rxc3 d5
106 114 27.f3 Kf7
110 110 28.fxe4 Rhe8
110 110 29.Rc7+ Kg6
110 108 30.Rf1 dxe4
110 108 31.Rc6 Rf8
108 108 32.Re6 Rae8
108 108 33.Rfxf6+ Rxf6
 98  98 34.Rxe8 Kf5
 98  98 35.Kf2 Rh6
 98  98 36.Rf8+ Ke5
 98  98 37.Re8+ Kf5
 98  98 38.Rf8+ Ke5
 1/2-1/2



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