### idea for chess rating of complexity for chess positions

Posted:

**Sat Oct 19, 2019 9:12 am**I thought that it is possible to give rating of complexity for chess positions based on the gain that strong engines get from doubling the time control from 2 minutes/40 move to 4 minutes/40 moves.

The idea is that you decide for example that the top 50 engines in the CCRL rating list participate and make a tournament when every engine has 2 entries:

enrty 1:the engine at time control of 4 minutes/40 moves

entry 2:the engine at time control of 2 minutes/40 moves

100 players can play 198 games because every possible pair play one game with white and one game with black.

You calculate based on the tournament the difference in points between the entries that used 4 minutes/40 moves and the entries that used 2 minutes/40 moves and you have a score for the complexity of the position.

Obvious drawn position or obvious win for one side of course are going to get rating of 0.

I do not know if it is possible to generate a position with negative rating but I guess that it may be possible if there is a trap that mainly strong engines fall into it and if you do not fall into the trap the result is obvious and finding the right moves after an engine fall into the trap is also relatively easy.

Note that my initial thinking was to calculate rating for all engines and look at the average rating difference but I decided that it may be impossible because some engine at 2 minutes/40 moves may score 0 points in some composed position and with 0 points it is impossible to give rating when it is possible always to calculate average of number of points the engines get.

The idea is that you decide for example that the top 50 engines in the CCRL rating list participate and make a tournament when every engine has 2 entries:

enrty 1:the engine at time control of 4 minutes/40 moves

entry 2:the engine at time control of 2 minutes/40 moves

100 players can play 198 games because every possible pair play one game with white and one game with black.

You calculate based on the tournament the difference in points between the entries that used 4 minutes/40 moves and the entries that used 2 minutes/40 moves and you have a score for the complexity of the position.

Obvious drawn position or obvious win for one side of course are going to get rating of 0.

I do not know if it is possible to generate a position with negative rating but I guess that it may be possible if there is a trap that mainly strong engines fall into it and if you do not fall into the trap the result is obvious and finding the right moves after an engine fall into the trap is also relatively easy.

Note that my initial thinking was to calculate rating for all engines and look at the average rating difference but I decided that it may be impossible because some engine at 2 minutes/40 moves may score 0 points in some composed position and with 0 points it is impossible to give rating when it is possible always to calculate average of number of points the engines get.