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 [1][2]. Doctor? was written in C and is therefor available for various hardware platforms and operating systems.
Doctor Who [3]

Program Characteristics

• STC-Search (solution tree cost oriented search) ^[5]
• 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
• Doctor 3.0? by Swaminathan Natarajan, CCC, April 01, 2009

External Links

• Doctor? by Dr. Hans-Joachim Kraas and Dr. Gunther Schrüfer
• Doctor 3.0 in CCRL 40/4

Refererences

1. ^ Fritz 5.32 - mehr als nur ein Update! by Peter Schreiner (German), Schachclub Leinzell
2. ^ Doctor? 2.0 / Engine MacIntosh from Schachversand Niggemann
3. ^ Doctor Who from Wikipedia
4. ^ Doctor? by Dr. Hans-Joachim Kraas and Dr. Gunther Schrüfer
5. ^ Günther Schrüfer (1988). Minimax-Suchen : Kosten, Qualität und Algorithmen. Braunschweig : Technische Universität. (German)

What links here?