Why it's not a draw?
Because theoretically White can mate. Eg. 71. ... Ka2 72. Nd2 Ka1 73. Kc3 b1=B 74. Kb4 Bc2 75. Ka3 Bb1 76. Nb3#
Cause the Pawn can become a Queen/Rook and win the game.
Cooperative checkmate is possible, therefore, they considered defeat
How would Spock decide on this issue?
Whoever runs out of time, loses the game. That's what clocks are for!
Not draw because the king can go to a2
Trying to win(?) with 69. ... Ka2 instead 69. ... b1Q with an instant draw... I think Black learned his lesson.
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