Ruy Lopez Berlin as the best defense against 1.e4 (by both SFNNUE and T60 Lco)

[Nay Lin Tun]

Berlin is Leela and A0 pet choice, but I recently noticed that SFNNUE also agreed. (both engines on 1 min analysis on 4 cores, 1060 gpu)

[Ajedrecista]

Hello:

Berlin is Leela and A0 pet choice, but I recently noticed that SFNNUE also agreed. (both engines on 1 min analysis on 4 cores, 1060 gpu)

The SF line 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nxe5 Be7 7. Bf1 Nxe5 8. Rxe5 O-O 9. d4 Bf6 10. Re1 Re8 (or a transposition) was first played by Steinitz and Zukertort no less than in the 1886 World Chess Championship! Source: Encyclopedia of Chess Openings, Volume C, 5th Edition, 2006. This agrees with ChessGames database, where the position after 11. c3 Rxe1+ 12. Qe1 (SF differs with 11. Bf4) was not played for a century, from 1899 to 1999. This position was played again in the 2013 World Chess Championship.

[d]r1bq2k1/pppp1ppp/3n1b2/8/3P4/2P5/PP3PPP/RNB1QBK1 b - -

ChessGames. Position search: r1bq2k1/pppp1ppp/3n1b2/8/3P4/2P5/PP3PPP/RNB1QBK1 b - -

Steinitz 0 - 1 Zukertort (New York, USA, 1886 WCC).

Carlsen ½ - ½ Anand (Chennai, India, 2013 WCC).

Regards from Spain.

Ajedrecista.