MESON Chess Problem Database

Problem Display
PID: 139037 (4B2r/K1QR4/p2N4/n1P4p/k5qR/2P5/PP6/2B5 w - - 0 1)

Bridgwater, Ralph Herbert

Kipping, Cyril Stanley

Pickering, S

The Problemist, 1937

4B2r/K1QR4/p2N4/n1P4p/k5qR/2P5/PP6/2B5

#2

11 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.Rxb4#
    • 1...Sc4
      • 2.b3#
    • 1...Sb7
      • 2.b3#
  • Tries
    • 1.Kxa6?
      • threat
        • 2.Qxa5#
      • 1...Sb3
        • 2.Qc6#
      • 1...Sc4
        • 2.Qc6#
        • 2.b3#
      • 1...Sc6
        • 2.Qxc6#
        • 2.b3#
      • 1...Sb7
        • 2.Qc6#
        • 2.b3#
      • 1...Qc4+!
    • 1.Sb7?
      • threat
        • 2.Rd4#
        • 2.Qxa5#
      • 1...Sc6+
        • 2.Qxc6#
      • 1...Rxe8
        • 2.Qxa5#
      • 1...Sxb7
        • 2.Rd4#
      • 1...Qb4
        • 2.Rxb4#
        • 2.Qxa5#
      • 1...Qc4
        • 2.Qxa5#
      • 1...Qd4
        • 2.Rdxd4#
        • 2.Qxa5#
      • 1...Sb3
        • 2.Rd4#
        • 2.Qc6#
      • 1...Sc4
        • 2.Qc6#
      • 1...Kb5!
    • 1.Rxg4+?
      • 1...Sc4
        • 2.Rxc4#
        • 2.b3#
      • 1...hxg4!
    • 1.Re7+?
      • 1...Sc6+
        • 2.Bxc6#
      • 1...Rxe8!
    • 1.Rf7+?
      • 1...Sc6+
        • 2.Bxc6#
      • 1...Rxe8!
    • 1.Rg7+?
      • 1...Sc6+
        • 2.Bxc6#
      • 1...Rxe8!
    • 1.Rh7+?
      • 1...Sc6+
        • 2.Bxc6#
      • 1...Rxe8!
    • 1.Rd8+?
      • 1...Sc6+
        • 2.Bxc6#
      • 1...Rxe8!
  • Keys
    • 1.b4!
      • threat
        • 2.Qxa5#
      • 1...Sc6+
        • 2.Qxc6#
      • 1...Qxd7
        • 2.bxa5#
      • 1...Qxb4
        • 2.Rxb4#
      • 1...Sb3
        • 2.Qc6#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sb7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(b);OGATE::R1(E),XQ(b)
    • S(c);N_GUARD,N_SPINQ(b)::P(C)
    • S(c);N_GUARD::P(C)
  • Tries
    • Try
      • K(H);P-FLIGHT,XP(e)
      • Threat
        • QAR1(I),XS(c)
      • Vars
        • S(c);N_GUARD::QAB(I)
      • Refutation
        • Q(b);CHECK
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,N_GUARD::QAB(I),XS(c)
        • R(f);XB(K)::QAR1(I),XS(c)
        • S(c);XS(G)::B(K)+R(J),DCHECK
        • Q(b);::QAR1(I),XS(c)
        • S(c);N_GUARD,N_SPINQ(b)::QAB(I)
      • Refutation
        • K(a);N_SPINQ(b),S_FLIGHT
    • Try
      • R(E);CHECK,XQ(b)
      • Refutation
        • P(d);XR(E)
    • Try
      • R(J);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::B(K),XS(c)
      • Refutation
        • R(f);XB(K)
    • Try
      • R(J);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::B(K),XS(c)
      • Refutation
        • R(f);XB(K)
    • Try
      • R(J);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::B(K),XS(c)
      • Refutation
        • R(f);XB(K)
    • Try
      • R(J);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::B(K),XS(c)
      • Refutation
        • R(f);XB(K)
    • Try
      • R(J);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::B(K),XS(c)
      • Refutation
        • R(f);XB(K)
  • Actual
    • P(C);N_PINQ(b)
    • Threat
      • QAR1(I),XS(c)
    • Vars
      • S(c);CHECK,N_GUARD::QAB(I),XS(c)
      • Q(b);P_PINQ(I),P_SPINQ(b),XR(J)::R(E)+P(C),XS(c)
      • Q(b);OGATE,P_SPINQ(b),XP(C)::R1(E),XQ(b)
      • S(c);N_GUARD::QAB(I)
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