MESON Chess Problem Database

Problem Display
PID: 207646 (5b2/4p1n1/p7/k4bQ1/pR2R3/5p2/5pp1/1K1Bn1B1 w - - 0 1)

Walton, FW

The Observer, 1954

(First published on Sun Jul 4 1954)

5b2/4p1n1/p7/k4bQ1/pR2R3/5p2/5pp1/1K1Bn1B1

#2

6 + 11

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...f1Q
      • 2.Bb6#
    • 1...f1S
      • 2.Bb6#
    • 1...f1B
      • 2.Bb6#
    • 1...f1R
      • 2.Bb6#
    • 1...e5
      • 2.Qd8#
    • 1...e6
      • 2.Qd8#
  • Tries
    • 1.Rb7?
      • threat
        • 2.Qd2#
      • 1...Sc2
        • 2.Re5#
      • 1...Sd3
        • 2.Rxa4#
      • 1...e5
        • 2.Qd8#
      • 1...e6
        • 2.Qd8#
      • 1...f1S!
    • 1.Rb8?
      • threat
        • 2.Qd2#
      • 1...Sc2
        • 2.Re5#
      • 1...Sd3
        • 2.Rxa4#
      • 1...e5
        • 2.Qd8#
      • 1...e6
        • 2.Qd8#
      • 1...f1S!
  • Keys
    • 1.Rb2!
      • threat
        • 2.Qd2#
      • 1...f1S
        • 2.Bb6#
      • 1...Sc2
        • 2.Re5#
      • 1...Sd3
        • 2.Rxa4#
      • 1...e5
        • 2.Qd8#
      • 1...e6
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • P(b);OGATE::B(C)
    • P(i);N_SPINB(g),OGATE::QAB(F)
    • P(i);OGATE::QAB(F)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAB(F)
      • Vars
        • S(a);N_PINR(E)::R(E)
        • S(a);N_PINR(E)::R1(E),XP(e)
        • P(i);N_SPINB(g),OGATE::QAB(F)
        • P(i);OGATE::QAB(F)
      • Refutation
        • P(b);
    • Try
      • R(D);
      • Threat
        • QAB(F)
      • Vars
        • S(a);N_PINR(E)::R(E)
        • S(a);N_PINR(E)::R1(E),XP(e)
        • P(i);N_SPINB(g),OGATE::QAB(F)
        • P(i);OGATE::QAB(F)
      • Refutation
        • P(b);
  • Actual
    • R(D);
    • Threat
      • QAB(F)
    • Vars
      • P(b);OGATE::B(C)
      • S(a);N_PINR(E)::R(E)
      • S(a);N_PINR(E)::R1(E),XP(e)
      • P(i);N_SPINB(g),OGATE::QAB(F)
      • P(i);OGATE::QAB(F)
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