Carlsen appears to have been tired

[Dann Corbit]

[d]8/1p3pk1/6p1/5r2/1P2QP1P/p3P3/3RK3/6q1 w - - bm Rd8;

[Lyudmil Tsvetkov]

[d]8/1p3pk1/6p1/5r2/1P2QP1P/p3P3/3RK3/6q1 w - - bm Rd8;

optimal performance in chess is not associated with perfect physical conditions, rather than perfect concentration and bigger workload the mind does.

perfect concentration might rise with better physical condition, but it might also fall with over-assurance, taking a light approach to the game, a range of other psychological factors, etc., etc.

competitive chess seems to be 90% about psychology and 10% about real strength.

still, being better at chess usually also translates as being better competitively overall.

[mhull]

[d]8/1p3pk1/6p1/5r2/1P2QP1P/p3P3/3RK3/6q1 w - - bm Rd8;

optimal performance in chess is not associated with perfect physical conditions, rather than perfect concentration and bigger workload the mind does.

perfect concentration might rise with better physical condition, but it might also fall with over-assurance, taking a light approach to the game, a range of other psychological factors, etc., etc.

competitive chess seems to be 90% about psychology and 10% about real strength.

still, being better at chess usually also translates as being better competitively overall.

Calm and objectivity are optimal but not always easy to dial-in. The ability to listen in silent attention to the language of reality is vital to success. The further one moves from that ideal, the closer one moves toward hallucination in chess.