This gave chess a depth of 11 class units up to 2800, which was world champion Garry Kasparov’s rating in 1990. If I recall correctly, checkers (${8 \times 8}$) and backgammon had depth 10 while bridge tied chess at 11, but Shogi scored 14 and yet was dwarfed by Japan’s main head game, Go, at 25.