MESON Chess Problem Database

Problem Display
PID: 194469 (2q1N3/Q1p5/1Pk1P3/8/2P5/4B3/8/4K3 w - - 0 1)

Rice, John Michael

British Chess Magazine, 2019

2q1N3/Q1p5/1Pk1P3/8/2P5/4B3/8/4K3

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Qxc7#
    • 1...Qxe6
      • 2.Qxc7#
    • 1...Qb7
      • 2.Qa4#
    • 1...Qd7
      • 2.Qa8#
    • 1...Qa8
      • 2.Qxc7#
      • 2.Qxa8#
    • 1...Qxe8
      • 2.Qxc7#
    • 1...cxb6
      • 2.Qxb6#
  • Tries
    • 1.Qa8+?
      • 1...Qb7
        • 2.Qa4#
      • 1...Qxa8!
    • 1.bxc7?
      • threat
        • 2.Qb6#
      • 1...Qxc7
        • 2.Qxc7#
      • 1...Qb8
        • 2.cxb8S#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qxe6!
  • Keys
    • 1.b7!
      • threat
        • 2.Qa6#
      • 1...Qxe6
        • 2.b8S#
      • 1...Qxb7
        • 2.Qc5#
      • 1...Qa8
        • 2.bxa8Q#
        • 2.bxa8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::QAR1(F),XP(b)
    • Q(c);N_GUARD,P_PINB(B),XP(E)::QAR1(F),XP(b)
    • Q(c);SBLOCK::QAB(F)
    • Q(c);N_GUARD::QAB(F)
    • Q(c);N_GUARD,XS(G)::QAR1(F),XP(b)
    • P(b);OGATE,XP(D)::QAR1(F),XP(b)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • Q(c);P_SPINQ(c),SBLOCK::QAB(F)
      • Refutation
        • Q(c);XQ(F)
    • Try
      • P(D);XP(b)
      • Threat
        • QAR1(F)
      • Vars
        • Q(c);OGATE,XP(D)::QAR1(F),XQ(c)
        • Q(c);OGATE::PXQ(c)=S
        • Q(c);N_GUARD::QAR2(F),XQ(c)
        • Q(c);SBLOCK::QAR1(F)
      • Refutation
        • Q(c);P_PINB(B),XP(E)
  • Actual
    • P(D);
    • Threat
      • QAR2(F)
    • Vars
      • Q(c);N_GUARD,P_PINB(B),XP(E)::P=S
      • Q(c);SBLOCK,XP(D)::QAR1(F)
      • Q(c);OGATE::PXQ(c)=Q
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