F7. Deep Blue

Year: 1997
Zone: Artificial Intelligence
Band: middle
Tier: Built

ChipTest (1985) and Deep Thought (1988) grew into IBM’s Deep Blue, which beat Garry Kasparov in 1997. Their strength was raw search. Drag the depth and watch the game tree explode.

Branching factor~35
Deep Thought~700K pos/s
Deep Blue, 1997~200M pos/s

Portal

About 20 legal first moves; mid-game positions average around 35.

Search depth · 4 half-moves ahead

1.5 million positions

Deep Thought · ~700K/s

2.1 s

Deep Blue · ~200M/s

8 ms

Full-width search with no pruning. Real engines cut most branches with alpha-beta pruning, which is how Deep Blue reached useful depths.

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