MESON Chess Problem Database

Problem Display
PID: 527 (1K6/3N4/b7/k3p2R/pNp5/P7/8/8 w - - 0 1)

Ling, John Francis

The Observer, 1959

1K6/3N4/b7/k3p2R/pNp5/P7/8/8

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.Rxe5#
    • 1...Bc8
      • 2.Rxe5#
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Sxc4#
      • 1...Kb5
        • 2.Sd7#
      • 1...Kb6
        • 2.Sd7#
      • 1...c3
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::R(C),XP(d)
    • B(e);N_GUARD::R(C),XP(d)
  • Actual
    • S(D);XP(d)
    • Threat
      • R(C)+S(D),DCHECK,XP(b)
    • Vars
      • K(c);P-FLIGHT::R(C)+S(D)
      • K(c);S_FLIGHT::S(D)
      • P(b);::R(C)+S(D),DCHECK
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