BT2450 a test is called, with which within the computer chess range the play strength can be determined by chess computers and chess programs. The test was developed at the beginning of the 1990er years by engineers Hubert Bednorz and Fred from whose name the contraction "“BT"” is derived. The test consists of 30 chess positions of the different phases of a game of chess.

For execution the time is measured, which a chess computer or a chess program needs, in order to find in each of the 30 positions the solution course. If the solution is not found within 15 minutes (900 seconds) per position, a time of 900 seconds enters test result for the appropriate position. This applies likewise, if a program finds the solution course within 15 minutes, for these however in the further process of the position evaluation in favor of another allegedly better course rejects. If a program determines first the solution course, then another and later again the correct solution, applies the time up to final finding of the solution.

The test result is calculated by the total time for the solution of all 30 positions according to the formula BT = 2,450 - 2 x total time (time in minutes) or BT = 2,450 - for total time/30 (time in seconds). The determined value is limited comparable with the internationally valid ELO values. To note it is with the fact however that with the BT2450-Test only the tactical abilities of a program are evaluated. The value attainable with the BT2450 lies between 1.550 and 2.450. To values under 1.650 or over 2.300 the test applies however as too inaccurate.

A revised version of the test is called BT2630. This differs from the BT2450-Test by the higher base value from 2.630 in the formula as well as by seven other positions. It was developed about two years later, in order to make a better evaluation possible of the risen play strength from good chess programs to. The original BT2450 is only used meanwhile for chess programs on small computers as for example PDAs.

A renewed advancement is the BS2830-Test developed by Hubert Bednorz and Heinz Josef Schumacher, which of 27 positions consists and according to the formula BS = 2,830 - total time/1.5 - (total time x total time)/(22 * 22) (time in minutes) one computes. This formula replaced originally the formula BS = 2,830 intended by the two developers of the test to 1998 - (total time x total time)/(17 * 17).

Related links

• BT2450 positions the 30 positions of the BT2450-Tests
• BT2630 positions the 30 positions of the BT2630-Tests

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