Remember ply level at which position previously occurred
authorH.G.Muller <hgm@hgm-xboard.(none)>
Mon, 15 May 2017 12:38:54 +0000 (14:38 +0200)
committerH.G.Muller <hgm@hgm-xboard.(none)>
Mon, 15 May 2017 12:42:53 +0000 (14:42 +0200)
commit35ae9015fc391bc3d81ceb30843f82ce28310c74
treee34513e6813041cd83524ab4fd7fc029a54a1cfc
parent88a44e94cd7046d43777e93e96ba59f5c7615b9d
Remember ply level at which position previously occurred

By storing the ply level of each latest occurrence of a position,
wecan know how far back to test for perpetuals.
dropper.c