MESON Chess Problem Database

Problem Display
PID: 218844 (3NBb2/1PR2Pp1/1P1k4/1p2r3/qP2p3/2Np3b/5P1B/4R1K1 w - - 0 1)

Turnbull, Ronald

The Problemist, 1987

3NBb2/1PR2Pp1/1P1k4/1p2r3/qP2p3/2Np3b/5P1B/4R1K1

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Rd7#
    • 1...Bg2
      • 2.Rd7#
    • 1...Bd7
      • 2.Rxd7#
    • 1...Bc8
      • 2.bxc8S#
    • 1...Be7
      • 2.Rc6#
  • Tries
    • 1.b8Q?
      • threat
        • 2.Ra7#
        • 2.Rb7#
        • 2.Rd7#
      • 1...Bd7
        • 2.Rxd7#
      • 1...Qa7
        • 2.Rxa7#
        • 2.Rd7#
      • 1...Qa8
        • 2.Rd7#
      • 1...Qxb4!
    • 1.b8B?
      • threat
        • 2.Ra7#
        • 2.Rb7#
        • 2.Rd7#
      • 1...Bd7
        • 2.Rxd7#
      • 1...Qa7
        • 2.Rxa7#
        • 2.Rd7#
      • 1...Qa8
        • 2.Rd7#
      • 1...Qxb4!
  • Keys
    • 1.f4!
      • threat
        • 2.fxe5#
      • 1...Rg5+
        • 2.fxg5#
      • 1...Rxe8
        • 2.fxe8S#
      • 1...exf4 ep
        • 2.Bxe5#
      • 1...Bd7
        • 2.Rxd7#
      • 1...Rc5
        • 2.bxc5#
      • 1...Rd5
        • 2.Sxe4#
      • 1...Rf5
        • 2.Rd7#
      • 1...Rh5
        • 2.f5#
      • 1...Re6
        • 2.Rd7#
      • 1...Re7
        • 2.Rc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 4
  • Sets
    • B(b);N_GUARD::R1(I)
    • B(b);N_GUARD::R1(I),XB(b)
    • B(b);OGATE::PXB(b)=S
    • B(i);SBLOCK::R1(I)
  • Tries
    • Try
      • P(H);
      • Threat
        • DUALS(3)
      • Vars
        • B(b);::QAB(H)+R(I),DCHECK,XB(b)
        • Q(c);::QAB(H)+R(I),DCHECK
      • Refutation
        • Q(c);XP(F)
    • Try
      • P(H);
      • Threat
        • DUALS(3)
      • Vars
        • B(b);::B(H)+R(I),DCHECK,XB(b)
        • Q(c);::B(H)+R(I),DCHECK
      • Refutation
        • Q(c);XP(F)
  • Actual
    • P(C);N_PINR(f)
    • Threat
      • P(C),XR(f)
    • Vars
      • R(f);CHECK,OGATE::B(D)+P(C),XR(f)
      • R(f);OGATE,XB(L)::PXR(f)=S
      • P(d);EP,OGATE,P_SPINR(f),XP(C)::B(D),XR(f)
      • B(b);N_GUARD::R1(I),XB(b)
      • R(f);OGATE::P(F),XR(f)
      • R(f);N_GUARD,SBLOCK::S(E),XP(d)
      • R(f);S_CUTB(b)::R1(I)
      • R(f);::B(D)+P(C)
      • R(f);SBLOCK::R1(I)
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