I have recently been working on the model's draw rate assumptions. For this tournament, it won't matter very much; in classical games between 2700 players, the draw rate is fairly stable around 60% - 64% unless there is a large rating gap. The project is not done yet, but there are a few preliminary results:
-1.d4 really is safer than 1.e4. All else equal, the draw rate in 1.d4 games is 2% higher than for 1.e4. An even safer choice is 1.c4 (3% more likely to end in a draw than 1.e4). Irregular openings are just as likely to end in a draw as 1.e4.
-Chess is not being exhausted: the draw rate is not rising over time after the players' ratings are accounted for.
These conclusions have seemed fairly stable as I have experimented with different draw rate models, but it is quite possible that a more thorough investigation will overturn them.
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