Doctor?

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Doctor?, is the commercial successor of Bobby II by Hans-Joachim Kraas and Günther Schrüfer. It was market by ChessBase as 16-bit engine in 1995 as analysis engine for ChessBase/Windows 1.0, and in 1998 as 32-bit add-on engine of the Fritz 5.32 package. Doctor? is written in C and was therefor available for various hardware platforms and operating systems. According to Ingo Althöfer, who used Doctor? in his triple-brain experiments, it was the first engine which implemented a k-best mode. Doctor?'s strengths were mainly due to strategy and unsual pawn structures in endgames. The engine uses fractional plies with a depth increment in iterative deepening of 1/3 ply.

=Program Characteristics=
 * STC-Search (solution tree cost oriented search)
 * Ample chess knowledge in evaluation function and search heuristics.
 * Positional playing style with tactical surprises.
 * Written fully in C
 * Implemented on Atari ST, PC (Unix, Win3.x, Win95/98, WinNT), Mac, Sun, BiiN

=Forum Posts=
 * Doctor module for Fritz/Chessbase? by MLK and RJP, rgcc, December 07, 1997
 * Re: Doctor module for Fritz/Chessbase? by Ingo Althöfer, rgcc, December 08, 1997


 * Doctor! 3.0, # nodes searched, and knowledge versus speed by Roger, rgcc, January 29, 1999
 * Doctor 3.0? by Swaminathan Natarajan, CCC, April 01, 2009

=External Links=
 * Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software - Schachversand Niggemann
 * Doctor 3.0 in CCRL 40/4

=Refererences=

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