MESON Chess Problem Database

Problem Display
PID: 80637 (b1Q5/5B2/3P2N1/4b1pK/Rn2k3/4pnrp/1rP1N1P1/8 w - - 0 1)

Watts, William

The Field, 1947

(First published on Sat Sep 6 1947)

b1Q5/5B2/3P2N1/4b1pK/Rn2k3/4pnrp/1rP1N1P1/8

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qxc2#
    • 1...Bd4
      • 2.Sxg3#
    • 1...Sd4
      • 2.Sc3#
  • Tries
    • 1.Sc3+?
      • 1...Kd4
        • 2.Qc4#
      • 1...Bxc3!
    • 1.Sxg3+?
      • 1...Kd4
        • 2.Qc4#
      • 1...Bxg3!
    • 1.Se7?
      • threat
        • 2.Bg6#
        • 2.Qf5#
        • 2.Qxa8#
      • 1...Rxc2
        • 2.Bg6#
        • 2.Qf5#
        • 2.Qxc2#
      • 1...Bxd6
        • 2.Qf5#
      • 1...Bc3
        • 2.Qf5#
      • 1...Bd4
        • 2.Qf5#
      • 1...Bf4
        • 2.Qf5#
      • 1...Bf6
        • 2.Qf5#
      • 1...Bg7
        • 2.Qf5#
      • 1...Bh8
        • 2.Qf5#
      • 1...Bd5
        • 2.Bxd5#
        • 2.Bg6#
        • 2.Qf5#
      • 1...Bc6
        • 2.Bg6#
        • 2.Qf5#
        • 2.Qxc6#
      • 1...Bb7
        • 2.Bg6#
        • 2.Qf5#
        • 2.Qxb7#
      • 1...Sh4
        • 2.Qxa8#
      • 1...Sd4!
    • 1.Rxb4+?
      • 1...Bd4
        • 2.Sc3#
        • 2.Sxg3#
      • 1...Sd4
        • 2.Sc3#
      • 1...Rxb4!
  • Keys
    • 1.Be6!
      • threat
        • 2.Qxa8#
      • 1...Rxc2
        • 2.Qxc2#
      • 1...Bd4
        • 2.Sxg3#
      • 1...Bd5
        • 2.Bf5#
      • 1...Bc6
        • 2.Qxc6#
      • 1...Bb7
        • 2.Qxb7#
      • 1...Sd4
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);OGATE,XP(A)::QAB(I),XR(a)
    • B(h);N_GUARD,N_SPINS(f),SBLOCK::S(B),XR(d)
    • S(c);N_SPINS(f),SBLOCK,S_CUTB(h)::S(B)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(g);P-FLIGHT::QAR1(I)
      • Refutation
        • B(h);XS(B)
    • Try
      • S(B);CHECK,XR(d)
      • Vars
        • K(g);P-FLIGHT::QAR1(I)
      • Refutation
        • B(h);XS(B)
    • Try
      • S(G);
      • Threat
        • DUALS(3)
      • Vars
        • B(h);XP(F)::QAB1(I)
        • B(h);::QAB1(I)
        • B(h);N_SPINS(f)::QAB1(I)
        • S(c);::QAB(I),XB(j)
      • Refutation
        • S(c);N_SPINS(f)
    • Try
      • R(D);CHECK,XS(f)
      • Vars
        • S(c);P_SPINS(c)::S(B)
      • Refutation
        • R(a);XR(D)
  • Actual
    • B(H);
    • Threat
      • QAB(I),XB(j)
    • Vars
      • R(a);OGATE,XP(A)::QAB(I),XR(a)
      • B(h);N_GUARD,N_SPINS(f),SBLOCK::S(B),XR(d)
      • B(j);SBLOCK::B(H)
      • B(j);N_GUARD::QAB(I),XB(j)
      • S(c);N_SPINS(f),SBLOCK,S_CUTB(h)::S(B)
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