Armageddon Chess

Clues in this puzzle

Across

• Deadlock that forces an apocalyptic decider (3)
• Final winner-take-all contest (7)

Down

• Countdown device ramping up pressure on every move (5)
• Crucial ticking resource on the Armageddon clock (4)
• Type of death experienced on the final board (6)
• Result that awards victory to Black in tiebreak play (4)
• Castle piece patrolling an apocalyptic file (4)

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