MESON Chess Problem Database

Problem Display
PID: 67035 (BrrR4/Bn1N4/4p3/p2kP3/p1pNp3/8/Q7/1K6 w - - 0 1)

Brotherton, David WA

1st Comm., The Observer, 1962

BrrR4/Bn1N4/4p3/p2kP3/p1pNp3/8/Q7/1K6

#2

8 + 9

136 Problem Observer 2006

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Qg2#
  • Tries
    • 1.Sb6+?
      • 1...Kc5
        • 2.Sd5#
        • 2.Qxc4#
        • 2.Qa3#
      • 1...Kxe5!
    • 1.Rxc8?
      • threat
        • 2.Qxc4#
      • 1...e3
        • 2.Qg2#
      • 1...Rxc8!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Se7#
      • 1...Sc5+
        • 2.Sb6#
      • 1...Sd6+
        • 2.Sb4#
      • 1...Sxd8+
        • 2.Sb4#
      • 1...Kxc6
        • 2.Qxc4#
      • 1...Rxc6
        • 2.Qd2#
      • 1...e3
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::QAB(B)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(e);N_SPINP(b),N_SPINS(g),P-FLIGHT,XP(D)
    • Try
      • R(H);XR(i)
      • Threat
        • QAB1(B),XP(b)
      • Vars
        • P(c);OGATEB::QAB(B)
      • Refutation
        • R(h);XR(H)
  • Actual
    • S(C);N_PINS(g)
    • Threat
      • S(C)
    • Vars
      • S(g);CHECK,SBLOCK::R(H)+S(F),DCHECK
      • S(g);CHECK::B(G)+S(C),DCHECK
      • S(g);CHECK,XR(H)::B(G)+S(C),DCHECK
      • K(e);N_SPINP(b),P_SPINS(g),S_FLIGHT,XS(C)::QAR2(B),XP(b)
      • R(i);SBLOCK,XS(C)::QAR(B)
      • P(c);OGATEB::QAB(B)
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