MESON Chess Problem Database

Problem Display
PID: 251255 (8/2K5/R2N2B1/2R5/1Ppk4/2n1nP1p/7q/Q5B1 w - - 0 1)

Francey, James

British Chess Magazine, 1933

8/2K5/R2N2B1/2R5/1Ppk4/2n1nP1p/7q/Q5B1

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg1
      • 2.Sb5#
    • 1...Qxd6+
      • 2.Rxd6#
    • 1...Qh1
      • 2.Sb5#
    • 1...Qa2
      • 2.Sb5#
    • 1...Qc2
      • 2.Sb5#
    • 1...Qd2
      • 2.Sb5#
    • 1...Qe2
      • 2.Sb5#
    • 1...Qf2
      • 2.Sb5#
    • 1...Qg2
      • 2.Sb5#
  • Tries
    • 1.Kb7?
      • threat
        • 2.Sb5#
      • 1...Qxd6
        • 2.Rxd6#
      • 1...Qb2!
    • 1.Kd7?
      • threat
        • 2.Sb5#
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Qb2!
    • 1.Kc8?
      • threat
        • 2.Sb5#
      • 1...Qxd6
        • 2.Rxd6#
      • 1...Qb2!
    • 1.Kd8?
      • threat
        • 2.Sb5#
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Qb2!
    • 1.Raa5?
      • threat
        • 2.Rxc4#
        • 2.Rd5#
      • 1...Qxg1
        • 2.Sb5#
      • 1...Qb2
        • 2.Rxc4#
      • 1...Qe5
        • 2.Rxc4#
      • 1...Qa2
        • 2.Sb5#
        • 2.Rd5#
      • 1...Qe2
        • 2.Sb5#
        • 2.Rd5#
      • 1...Qf2
        • 2.Sb5#
      • 1...Qxd6+!
    • 1.Qb2?
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Qxg1
        • 2.Sb5#
        • 2.Qd2#
      • 1...Qg3
        • 2.Qd2#
      • 1...Qf4
        • 2.Qd2#
      • 1...Qe5
        • 2.Qd2#
      • 1...Qh1
        • 2.Sb5#
        • 2.Qd2#
      • 1...Qc2
        • 2.Sb5#
      • 1...Qd2
        • 2.Sb5#
        • 2.Qxd2#
      • 1...Qe2
        • 2.Sb5#
      • 1...Qf2
        • 2.Sb5#
      • 1...Qg2
        • 2.Sb5#
      • 1...Qxb2!
    • 1.Qd1+?
      • 1...Qd2
        • 2.Qxd2#
      • 1...Sxd1!
  • Keys
    • 1.Be4!
      • threat
        • 2.Rd5#
      • 1...Qxd6+
        • 2.Rxd6#
      • 1...Qxg1
        • 2.Sb5#
      • 1...Qb2
        • 2.Sf5#
      • 1...Qe5
        • 2.Rxc4#
      • 1...Qf2
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_PINS(G),XB(B)::S(G)
    • Q(a);CHECK,OGATE,XS(G)::R(F),XQ(a)
    • Q(a);N_PINS(G)::S(G)
  • Tries
    • Try
      • K(I);N_SPINS(G),P-FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(a);OGATE,XS(G)::R(F),XQ(a)
      • Refutation
        • Q(a);N_SPINS(b),P_PINP(D),P_SPINS(c)
    • Try
      • K(I);N_SPINS(G),P-FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(a);CHECK,OGATE,XS(G)::R(F),XQ(a)
      • Refutation
        • Q(a);N_SPINS(b),P_SPINS(c)
    • Try
      • K(I);N_SPINS(G),P-FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(a);OGATE,XS(G)::R(F),XQ(a)
      • Refutation
        • Q(a);N_SPINS(b),P_SPINS(c)
    • Try
      • K(I);N_SPINS(G),S_FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(a);CHECK,OGATE,XS(G)::R(F),XQ(a)
      • Refutation
        • Q(a);N_SPINS(b),P_SPINS(c)
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_PINS(G),XB(B)::S(G)
        • Q(a);N_PINS(G),N_SPINS(b),P_SPINS(c)::R1(E),XP(e)
        • Q(a);::R1(E),XP(e)
        • Q(a);N_PINS(G)::S(G)
      • Refutation
        • Q(a);CHECK,XS(G)
    • Try
      • Q(A);
      • Vars
        • Q(a);CHECK,OGATE,XS(G)::R(F),XQ(a)
        • Q(a);N_GUARD::QAR2(A)
        • Q(a);N_PINS(G)::S(G)
      • Refutation
        • Q(a);N_PINS(G),N_SPINS(b),P_SPINS(c),XQ(A)
    • Try
      • Q(A);CHECK,N_PINS(b),P_PINS(c)
      • Vars
        • Q(a);N_GUARD,N_PINS(G),P_SPINQ(a)::QAR2(A),XQ(a)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • B(H);
    • Threat
      • R1(E)
    • Vars
      • Q(a);CHECK,OGATE,XS(G)::R(F),XQ(a)
      • Q(a);N_PINS(G),XB(B)::S(G)
      • Q(a);N_PINS(G),N_SPINS(b),P_SPINS(c)::S(G)
      • Q(a);SBLOCK::R1(E),XP(e)
      • Q(a);N_PINS(G)::S(G)
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