MESON Chess Problem Database

Problem Display
PID: 173574 (3N4/B2p1r2/3k1p2/3Nr2p/3R4/5KQ1/3pR3/8 w - - 0 1)

Macleod, Norman Alasdair

3rd Prize, Boletim da UBP, 1984-1985

3N4/B2p1r2/3k1p2/3Nr2p/3R4/5KQ1/3pR3/8

#2

7 + 7

1077 Boletim da UBP 1988

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qxe5#
  • Tries
    • 1.Rxe5?
      • threat
        • 2.Re1#
        • 2.Re2#
        • 2.Re3#
        • 2.Ree4#
        • 2.Rf5#
        • 2.Rg5#
        • 2.Rxh5#
        • 2.Re6#
        • 2.Re7#
        • 2.Re8#
      • 1...d1Q+
        • 2.Re2#
      • 1...d1B+
        • 2.Re2#
      • 1...Rg7
        • 2.Rg5#
        • 2.Re6#
      • 1...Re7
        • 2.Re6#
        • 2.Rxe7#
      • 1...h4
        • 2.Re6#
      • 1...f5
        • 2.Rxf5#
        • 2.Re6#
      • 1...fxe5+!
  • Keys
    • 1.Kf4!
      • threat
        • 2.Qa3#
      • 1...Re4+
        • 2.Kxe4#
      • 1...Rf5+
        • 2.Kxf5#
      • 1...Rxd5
        • 2.Kf3#
      • 1...Re3
        • 2.Kxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(e);N_GUARD::QAB1(C),XR(b)
  • Tries
    • Try
      • R(A);XR(b)
      • Threat
        • DUALS(10)
      • Vars
        • P(a);CHECK::QAB(C)+R(A)
        • P(c);::QAB(C)+R(A),DCHECK
      • Refutation
        • P(e);CHECK,P_SPINP(e),XR(A)
  • Actual
    • K(B);N_PINR(b),P-FLIGHT
    • Threat
      • QAB(C)
    • Vars
      • R(b);CHECK::QAB(C)+K(B),XR(b)
      • R(b);P_SPINR(b),XS(E)::QAB(C)+K(B)
      • R(b);::QAB(C)+K(B),XR(b)
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