MESON Chess Problem Database

Problem Display
PID: 146143 (nKn5/1P6/k7/Pr6/1PQ1B3/8/8/8 w - - 0 1)

Lipton, Michael

The Problemist, 1952

nKn5/1P6/k7/Pr6/1PQ1B3/8/8/8

#2

6 + 4

14867 BCPS Library 2012

SOLUTION

  • SOUND
  • Tries
    • 1.Kxa8?
      • threat
        • 2.bxc8Q#
        • 2.bxc8B#
        • 2.b8S#
      • 1...Sd6
        • 2.b8S#
      • 1...Sa7
        • 2.b8S#
      • 1...Se7
        • 2.b8S#
      • 1...Sb6+!
    • 1.Qe6+?
      • 1...Rb6
        • 2.Bd3#
      • 1...Sab6
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Scb6
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Sd6!
  • Keys
    • 1.Qc6+!
      • 1...Rb6
        • 2.Bd3#
      • 1...Sab6
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Scb6
        • 2.bxa8Q#
        • 2.bxa8R#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(F);N_SPINP(E),P-FLIGHT,XS(c)
      • Threat
        • DUALS(3)
      • Vars
        • S(d);::P=S
      • Refutation
        • S(d);CHECK
    • Try
      • Q(B);CHECK,N_PINR(a)
      • Vars
        • R(a);P_SPINR(a),S_CUTS(c),S_CUTS(d),S_CUTS(d)::B(C)
        • S(c);N_PINP(E),P_SPINS(c)::PXS(d)=Q
        • S(d);N_PINP(E),P_SPINS(d)::PXS(c)=Q
      • Refutation
        • S(d);P_SPINS(d)
  • Actual
    • Q(B);CHECK,N_PINR(a)
    • Vars
      • R(a);P_SPINR(a),S_CUTS(c),S_CUTS(d)::B(C)
      • S(c);N_PINP(E),P_SPINS(c)::PXS(d)=Q
      • S(d);N_PINP(E),P_SPINS(d)::PXS(c)=Q
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