MESON Chess Problem Database

Problem Display
PID: 10752 (7Q/1BR1Rn2/N2k1qr1/3P2B1/b7/1p6/1p6/1K6 w - - 0 1)

Valois, Paul Stedman

The Problemist, 1967

7Q/1BR1Rn2/N2k1qr1/3P2B1/b7/1p6/1p6/1K6

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.Bxe7#
    • 1...Rxg5
      • 2.Qxf6#
    • 1...Rg8
      • 2.Qxf6#
    • 1...Bd7
      • 2.Rcxd7#
  • Tries
    • 1.Qd8+?
      • 1...Bd7
        • 2.Rcxd7#
        • 2.Qxd7#
      • 1...Sxd8!
    • 1.Qf8?
      • threat
        • 2.Re6#
      • 1...Qf1+
        • 2.Re1#
      • 1...Qf5+
        • 2.Re4#
      • 1...Qxe7
        • 2.Qxe7#
      • 1...Qe6
        • 2.Rxe6#
      • 1...Bc6!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Rcd7#
      • 1...Qf1+
        • 2.Rc1#
      • 1...Qf5+
        • 2.Rc2#
      • 1...Qxe7
        • 2.Rxe7#
      • 1...Bd7
        • 2.Rcxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(e);OGATE,XR(G)::B(C),XQ(e)
    • R(f);N_GUARD,XB(C)::QAR2(H),XQ(e)
    • R(f);N_GUARD::QAR2(H),XQ(e)
    • B(c);N_GUARD::R1(F),XB(c)
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • S(g);XQ(H)
    • Try
      • Q(H);
      • Threat
        • QAB(H)+R(G),DCHECK
      • Vars
        • Q(e);CHECK,N_GUARD::QAB(H)+R(G)
        • Q(e);OGATE,P_SPINQ(e),XR(G)::QAB1(H),XQ(e)
        • Q(e);::QAB(H)+R(G),DCHECK,XQ(e)
      • Refutation
        • B(c);
  • Actual
    • Q(H);
    • Threat
      • QAB(H)+R(F),DCHECK
    • Vars
      • Q(e);CHECK::QAB(H)+R(F)
      • Q(e);OGATE,XR(G)::QAB(H)+R(F),XQ(e)
      • B(c);::QAB(H)+R(F),DCHECK,XB(c)
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