Deep Blue was world-champion level at chess but could not do anything else.

True if historical accounts show that IBM's Deep Blue played chess at world-champion level (for example by beating Kasparov in 1997) and was a specialised chess system that could not perform other tasks. Mostly true if both points hold in substance, with only a minor nuance, such as its underlying hardware being general-purpose in principle. Mixed if one of the two points is clearly wrong. Mostly false if Deep Blue is shown to have done substantial non-chess work as the same system. False if Deep Blue never reached world-champion level and was not limited to chess.

Set before the research began.

1. E1 After Sudden Defeat, It's Kasparov Who's Blue Los Angeles Times · 12 May 1997

   “In a shockingly sudden conclusion to their much-hyped battle, the IBM supercomputer Deep Blue took barely an hour Sunday to defeat world chess champion Garry Kasparov, clinching a $1.1-million duel between brain power and processing speed.”

2. E2 Deep Blue (chess computer) - Wikipedia Wikipedia · 17 April 2002 Own record

   “In 1997, it underwent an upgrade, and in a six-game rematch it defeated Kasparov by winning two games and drawing three.”

3. E3 What is Artificial Intelligence? O'Reilly Media (O'Reilly Radar) · 29 June 2016

   “Deep Blue, Watson, and AlphaGo were all highly specialized, single-purpose machines that did one thing extremely well. Deep Blue and Watson can’t play Go, and AlphaGo can’t play chess or Jeopardy, even on a basic level.”

4. E4 Deep Blue (chess computer) - Wikipedia Wikipedia · 17 April 2002 Own record

   “In 1997, Deep Blue was upgraded again to become the 259th most powerful supercomputer according to the TOP500 list, achieving 11.38 GFLOPS on the parallel high performance LINPACK benchmark.”

E1, a 1997 Los Angeles Times report, says Deep Blue defeated world chess champion Garry Kasparov, and E2 confirms the 1997 rematch win, so Deep Blue played at world-champion level. E3 describes Deep Blue as a highly specialised, single-purpose machine that did one thing extremely well and could not play Go, which supports the claim that it was limited to chess. E4 adds a minor qualification: the upgraded machine was also measured on the general LINPACK supercomputing benchmark, which suggests the underlying hardware could run general computation. Nothing shows it doing substantial non-chess work as the same system.