Computer chess

Koivisto is the winner of TCEC S21 Qualification League

Koivisto, the open source chess engine by Kim Kåhre and Finn Eggers, is the winner of the Qualification League of the Top Chess Engine Championship. Koivisto secured the QL title with a last round win, collecting 20,0/26 – 15 wins, 10 draws, and one loss.
ClassicAra, one of the newcomers to TCEC, is second with 19,0/26, while Booot gets the bronze with 18,0/26.

Final ranking of the Qualification League

Eight engines progress to L4

The Qualification League is the lowest division of TCEC’s league system with engines ranging from 3000 to 3400 ELO. With 14 engines participating, this season’s QL had an average 3206 ELO. This is 11 rating points more than S19’s 3195 ELO, where notable engines like SlowChess (currently a top contender in League 1) participated.

Eight engines from the Qualification League progress to the next stage of the competition. Besides the medalists Koivisto, ClassicAra, and Booot, we see Cheng, Stash, Nirvana, Amoeba, and Drofa advancing.

The qualified engines will be joined by the already seeded Halogen, Monolith, ChessFighter, and Mr. Bob.

League 4 is already underway and you can follow the live games at the official website

Table: QL stats

Record breaking Qualification League

The close race for the top positions and the qualification spots attracted serious interest, making the Qualification League the most viewed QL in TCEC history. The last day alone had peak concurrent viewers of ~400 and total 11 000 unique visitors. This viewership is far from the number of fans joining the Premier Division or the Superfinal, but certainly is the record for the lowest division of TCEC.

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