MESON Chess Problem Database

Problem Display
PID: 12023 (1B2K3/7p/4p1nr/2N5/R7/1B3kpp/3Pqp1R/3Q4 w - - 0 1)

Vaughan, Colin V

The Problemist, 1973

1B2K3/7p/4p1nr/2N5/R7/1B3kpp/3Pqp1R/3Q4

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd1
      • 2.Bxd1#
    • 1...Sf4
      • 2.Rxf4#
    • 1...Sh4
      • 2.Rf4#
    • 1...Se7
      • 2.Rf4#
    • 1...Sf8
      • 2.Rf4#
    • 1...Sh8
      • 2.Rf4#
    • 1...f1S
      • 2.Qxe2#
    • 1...f1R
      • 2.Qxe2#
    • 1...gxh2
      • 2.Qh1#
  • Tries
    • 1.Rxf2+?
      • 1...gxf2
        • 2.Qh1#
      • 1...Kxf2!
  • Keys
    • 1.Bxe6!
      • threat
        • 2.Ra3#
      • 1...Qxd1
        • 2.Bg4#
      • 1...gxh2
        • 2.Qh1#
      • 1...f1S
        • 2.Qxe2#
      • 1...Sf4
        • 2.Rxf4#
      • 1...Se5
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(D),XQ(a)
    • S(g);N_GUARD::R1(E),XS(g)
    • S(g);N_GUARD::R1(E)
    • P(b);::QAB1(A),XQ(a)
    • P(d);N_GUARD,XR(C)::QAB(A)
  • Tries
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • P(d);SBLOCK,XR(C)::QAB(A)
      • Refutation
        • K(c);N_SPINQ(a),P-FLIGHT,XR(C)
  • Actual
    • B(D);P_SPINB(D),XP(f)
    • Threat
      • R(E)
    • Vars
      • Q(a);N_PINB(D),N_SPINQ(a),XQ(A)::B(D)
      • P(d);N_GUARD,XR(C)::QAB(A)
      • P(b);::QAB1(A),XQ(a)
      • S(g);N_GUARD::R1(E),XS(g)
      • S(g);N_PINB(D)::B(D)
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