MESON Chess Problem Database

Problem Display
PID: 200574 (2N5/2p5/2p5/2k1p3/2B1K3/3PP3/Nn6/Q7 w - - 0 1)

Lider, Valentin Viktorovich

The Problemist, 1983

2N5/2p5/2p5/2k1p3/2B1K3/3PP3/Nn6/Q7

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qxe5#
    • 1...Sa4
      • 2.Qxe5#
  • Tries
    • 1.Ba6?
      • 1...Sxd3
        • 2.Qc3#
      • 1...Sd1
        • 2.Qxe5#
      • 1...Sa4
        • 2.Qxe5#
      • 1...Sc4!
    • 1.Qb1?
      • 1...Sxc4
        • 2.Qb4#
      • 1...Sd1
        • 2.Qb4#
      • 1...Sa4
        • 2.Qb4#
      • 1...Sxd3!
    • 1.Qe1?
      • threat
        • 2.Qb4#
        • 2.Qa5#
      • 1...Sxc4
        • 2.Qb4#
      • 1...Sxd3!
  • Keys
    • 1.Qc1!
      • 1...Sxd3
        • 2.Bxd3#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Sd1
        • 2.Qa3#
      • 1...Sa4
        • 2.Qa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE::QAR2(A),XP(c)
  • Tries
    • Try
      • B(E);
      • Vars
        • S(a);OGATE,XP(C)::QAR2(A)
        • S(a);OGATE::QAR2(A),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Vars
        • S(a);OGATE,XB(E)::QAB1(A)
        • S(a);OGATE::QAB1(A)
      • Refutation
        • S(a);XP(C)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XB(E)::QAB1(A)
      • Refutation
        • S(a);XP(C)
  • Actual
    • Q(A);
    • Vars
      • S(a);OGATE,XP(C)::QAR(A)+B(E),XS(a)
      • S(a);OGATE,P_SPINS(a),XB(E)::QAR1(A),XS(a)
      • S(a);OGATE::QAB(A)
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