MESON Chess Problem Database

Problem Display
PID: 51868 (1B2N3/2N5/2p1B3/Rr1rkp1n/2R2pP1/2KPP3/1Q6/8 w - - 0 1)

Barnes, Barry Peter

The Problemist, 2004

(First published on Thu Jan 1 2004)

1B2N3/2N5/2p1B3/Rr1rkp1n/2R2pP1/2KPP3/1Q6/8

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3+
      • 2.Kxb3#
    • 1...Rb4
      • 2.Kxb4#
    • 1...Rxd3+
      • 2.Kxd3#
    • 1...Rd4
      • 2.exd4#
    • 1...Sg3
      • 2.exf4#
    • 1...Sf6
      • 2.exf4#
    • 1...Sg7
      • 2.exf4#
    • 1...fxg4
      • 2.Re4#
  • Tries
    • 1.Kc2+?
      • 1...Rd4
        • 2.Qxd4#
        • 2.exd4#
      • 1...Rxb2+!
    • 1.Kd2+?
      • 1...Rd4
        • 2.Qxd4#
        • 2.exd4#
      • 1...Rxb2+!
    • 1.Bxf5?
      • threat
        • 2.Re4#
      • 1...Rb3+
        • 2.Kxb3#
      • 1...Rxd3+
        • 2.Kxd3#
      • 1...Rb4
        • 2.Kxb4#
        • 2.d4#
      • 1...Rd4
        • 2.exd4#
      • 1...Rdc5
        • 2.d4#
      • 1...Sg3
        • 2.exf4#
      • 1...Sf6
        • 2.exf4#
      • 1...Rbc5!
  • Keys
    • 1.gxf5!
      • threat
        • 2.Re4#
      • 1...Rb3+
        • 2.Kxb3#
      • 1...Rxd3+
        • 2.Kxd3#
      • 1...Rb4
        • 2.Kxb4#
      • 1...Rbc5
        • 2.Sxd5#
      • 1...Rd4
        • 2.exd4#
      • 1...Rdc5
        • 2.Sxb5#
      • 1...Sg3
        • 2.exf4#
      • 1...Sf6
        • 2.exf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(b);CHECK,P_SPINR(c)::QAB(A)+K(B),XR(b)
    • R(b);P_SPINR(c)::QAB(A)+K(B),XR(b)
    • R(c);CHECK,P_SPINR(b),XP(C)::QAB(A)+K(B),XR(c)
    • R(c);OGATE,P_SPINR(b)::P(D),XR(c)
    • S(f);N_GUARD::P(D),XP(a)
    • P(e);N_GUARD,XP(F)::R1(E)
  • Tries
    • Try
      • K(B);CHECK,P-FLIGHT
      • Refutation
        • R(b);CHECK,P_SPINR(c),XQ(A)
    • Try
      • K(B);CHECK,P_SPINP(C),S_FLIGHT
      • Refutation
        • R(b);CHECK,P_SPINR(c),XQ(A)
    • Try
      • B(H);XP(e)
      • Threat
        • R1(E)
      • Vars
        • R(b);CHECK,P_SPINR(c)::QAB(A)+K(B),XR(b)
        • R(c);CHECK,P_SPINR(b),XP(C)::QAB(A)+K(B),XR(c)
        • R(c);OGATE,P_SPINR(b)::P(D),XR(c)
        • R(c);N_GUARD,P_PINR(E)::P(C)
        • S(f);N_GUARD::P(D),XP(a)
      • Refutation
        • R(b);P_PINR(E)
  • Actual
    • P(F);XP(e)
    • Threat
      • R1(E)
    • Vars
      • R(b);CHECK,P_SPINR(c)::QAB(A)+K(B),XR(b)
      • R(c);CHECK,P_SPINR(b),XP(C)::QAB(A)+K(B),XR(c)
      • R(b);P_SPINR(c)::QAB(A)+K(B),XR(b)
      • R(b);N_GUARD,P_PINR(E)::B(J)+S(I),XR(c)
      • R(c);OGATE,P_SPINR(b)::P(D),XR(c)
      • R(c);N_GUARD,P_PINR(E)::B(J)+S(I),XR(b)
      • S(f);N_GUARD::P(D),XP(a)
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