kate/BadFish: Stockfish modified to play the worst move

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Stockfish modified to play the worst move

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Marco Costalba e8baf2b772 Ensure ttValue != VALUE_NONE in singular extension search The assert: assert(ttValue != VALUE_NONE); Could fire for multiple reasons (although is very rare), for instance after an IID we can have ttMove != MOVE_NONE while ttValue is still set at VALUE_NONE. But not only this, actually SMP is a source of corrupted ttValue and anyhow we can detect the condition: ttMove != MOVE_NONE && ttValue == VALUE_NONE even north of IID. Reported by Ronald de Man. It is so rare that bench didn't change. bench: 7710548	2014-06-21 13:07:29 +02:00
src	Ensure ttValue != VALUE_NONE in singular extension search	2014-06-21 13:07:29 +02:00
Copying.txt	Initial import of Glaurung 2.1	2008-09-01 07:59:13 +02:00
Readme.md	Update Readme.md	2014-06-04 22:31:59 +02:00

Marco Costalba e8baf2b772 Ensure ttValue != VALUE_NONE in singular extension search

The assert:

  assert(ttValue != VALUE_NONE);

Could fire for multiple reasons (although is very rare),
for instance after an IID we can have ttMove != MOVE_NONE
while ttValue is still set at VALUE_NONE.

But not only this, actually SMP is a source of corrupted
ttValue and anyhow we can detect the condition:

 ttMove != MOVE_NONE && ttValue == VALUE_NONE

even north of IID.

Reported by Ronald de Man.

It is so rare that bench didn't change.

bench: 7710548

2014-06-21 13:07:29 +02:00

src

Ensure ttValue != VALUE_NONE in singular extension search

2014-06-21 13:07:29 +02:00

Copying.txt

Initial import of Glaurung 2.1

2008-09-01 07:59:13 +02:00

Readme.md

Update Readme.md

2014-06-04 22:31:59 +02:00

Readme.md

Overview

Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is not a complete chess program and requires some UCI-compatible GUI (e.g. XBoard with PolyGlot, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz) in order to be used comfortably. Read the documentation for your GUI of choice for information about how to use Stockfish with it.

This version of Stockfish supports up to 128 cores. The engine defaults to one search thread, so it is therefore recommended to inspect the value of the Threads UCI parameter, and to make sure it equals the number of CPU cores on your computer.

Files

This distribution of Stockfish consists of the following files:

Readme.md, the file you are currently reading.
Copying.txt, a text file containing the GNU General Public License.
src, a subdirectory containing the full source code, including a Makefile that can be used to compile Stockfish on Unix-like systems.

Compiling it yourself

On Unix-like systems, it should be possible to compile Stockfish directly from the source code with the included Makefile.

Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT instruction, big-endian machines such as Power PC, and other platforms.

In general it is recommended to run make help to see a list of make targets with corresponding descriptions. When not using the Makefile to compile (for instance with Microsoft MSVC) you need to manually set/unset some switches in the compiler command line; see file types.h for a quick reference.

Terms of use

Stockfish is free, and distributed under the GNU General Public License (GPL). Essentially, this means that you are free to do almost exactly what you want with the program, including distributing it among your friends, making it available for download from your web site, selling it (either by itself or as part of some bigger software package), or using it as the starting point for a software project of your own.

The only real limitation is that whenever you distribute Stockfish in some way, you must always include the full source code, or a pointer to where the source code can be found. If you make any changes to the source code, these changes must also be made available under the GPL.

For full details, read the copy of the GPL found in the file named Copying.txt