MESON Chess Problem Database

Problem Display
PID: 23131 (k7/1bK5/p1n5/2QB4/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

k7/1bK5/p1n5/2QB4/8/8/8/8

#2

3 + 4

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Bxb7#
    • 1...Sd4
      • 2.Bxb7#
    • 1...Se5
      • 2.Bxb7#
    • 1...Sa7
      • 2.Bxb7#
    • 1...Se7
      • 2.Bxb7#
    • 1...Sb8
      • 2.Bxb7#
  • Tries
    • 1.Qa7+?
      • 1...Sxa7
        • 2.Bxb7#
      • 1...Kxa7!
    • 1.Qb5?
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Bc8
        • 2.Qb8#
      • 1...Sa5
        • 2.Qxa6#
      • 1...Sd8
        • 2.Qxa6#
      • 1...axb5!
    • 1.Qxc6?
      • threat
        • 2.Qxb7#
        • 2.Qxa6#
      • 1...Ka7
        • 2.Qxb7#
      • 1...a5
        • 2.Qxb7#
        • 2.Qa6#
      • 1...Bxc6!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxb7#
      • 1...Bc8
        • 2.Qb8#
      • 1...Sa5
        • 2.Qxa6#
      • 1...Sd8
        • 2.Qxa6#

Anticipated by 171016(1931)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(b);OGATE,P_SPINB(c)::B(B),XB(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);OGATE,P_SPINB(c),SBLOCK,XQ(A)::B(B),XB(c)
      • Refutation
        • K(d);P-FLIGHT,XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XB(c)
      • Vars
        • K(d);P-FLIGHT::QAR1(A),XB(c)
        • B(c);OGATE,P_SPINS(b)::QAR1(A)
        • S(b);N_GUARD,P_SPINB(c)::QAR2(A),XP(a)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);P_PINB(c),XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);N_SPINB(c),P-FLIGHT::QAR1(A),XB(c)
      • Refutation
        • B(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XB(c)
    • Vars
      • B(c);OGATE,P_SPINS(b)::QAR1(A)
      • S(b);N_GUARD,P_SPINB(c)::QAR2(A),XP(a)
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