MESON Chess Problem Database

Problem Display
PID: 6258 (1R2K2n/2p2N2/p1k3qQ/5p2/2B4b/1N1RP1B1/8/n6b w - - 0 1)

Mansfield, Comins

De Problemist, 1928

1R2K2n/2p2N2/p1k3qQ/5p2/2B4b/1N1RP1B1/8/n6b

#2

9 + 9

3202 Complete Mansfield/I 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Se5#
    • 1...Qe6+
      • 2.Qxe6#
    • 1...Qf6
      • 2.Se5#
      • 2.Sd8#
    • 1...Qxh6
      • 2.Se5#
    • 1...Bd5
      • 2.Bxd5#
    • 1...Bxg3
      • 2.Qxh1#
    • 1...Bg5
      • 2.Qxh1#
    • 1...Bf6
      • 2.Qxh1#
    • 1...Be7
      • 2.Qxh1#
    • 1...Bd8
      • 2.Qxh1#
    • 1...a5
      • 2.Bb5#
  • Tries
    • 1.Bxa6?
      • threat
        • 2.Bb5#
      • 1...Qe6+
        • 2.Qxe6#
      • 1...Sxb3!
    • 1.Rd6+?
      • 1...Qxd6
        • 2.Se5#
      • 1...cxd6!
    • 1.Rd7?
      • threat
        • 2.Rxc7#
      • 1...Qe6+
        • 2.Qxe6#
      • 1...Bxg3
        • 2.Qxh1#
      • 1...Qd6
        • 2.Se5#
      • 1...Bd8
        • 2.Qxh1#
      • 1...f4!
    • 1.Qxg6+?
      • 1...Bf6
        • 2.Se5#
        • 2.Sd8#
        • 2.Qxf6#
      • 1...Sxg6!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Be6#
      • 1...Qe6+
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Sxb3
        • 2.Bxb3#
      • 1...Qd6
        • 2.Se5#
      • 1...Qf6
        • 2.Sd8#
      • 1...Bd5
        • 2.Bb5#
      • 1...Bf6
        • 2.Qxh1#
      • 1...Be7
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_PINS(G)::S(G)
    • Q(g);CHECK,N_PINS(G),OGATE::QAR2(F),XQ(g)
    • Q(g);N_PINS(G),N_SPINQ(g),XQ(F)::S(G)
    • B(b);N_GUARD::B(E),XB(b)
    • B(c);OGATE,XB(D)::QAB(F),XB(b)
    • B(c);OGATE::QAB(F),XB(b)
    • B(c);N_SPINQ(g),OGATE::QAB(F),XB(b)
    • P(e);N_GUARD::B(E)
  • Tries
    • Try
      • B(E);XP(e)
      • Threat
        • B(E)
      • Vars
        • Q(g);CHECK,N_PINS(G),OGATE::QAR2(F),XQ(g)
      • Refutation
        • S(a);XS(A)
    • Try
      • R(B);CHECK,N_PINQ(g)
      • Vars
        • Q(g);N_PINS(G),P_SPINQ(g),XR(B)::S(G)
      • Refutation
        • P(h);XR(B)
    • Try
      • R(B);
      • Threat
        • R1(B),XP(h)
      • Vars
        • Q(g);CHECK,N_PINS(G),OGATE::QAR2(F),XQ(g)
        • B(c);OGATE,XB(D)::QAB(F),XB(b)
        • Q(g);N_PINS(G)::S(G)
        • B(c);OGATE::QAB(F),XB(b)
      • Refutation
        • P(d);
    • Try
      • Q(F);CHECK,N_SPINS(G),XQ(g)
      • Refutation
        • S(i);XQ(F)
  • Actual
    • R(B);
    • Threat
      • R(B)+B(E)
    • Vars
      • S(a);OGATE,XS(A)::R(B)+B(E),XS(a)
      • Q(g);N_PINS(G)::S(G)
      • B(b);SBLOCK::R(B)+B(E),DCHECK
      • B(c);N_SPINQ(g),OGATE::QAB(F),XB(b)
      • B(c);OGATE::QAB(F),XB(b)
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