MESON Chess Problem Database

Problem Display
PID: 192639 (3RrB1b/4p3/KprnQ3/1PkN2N1/1p4R1/4p3/B7/6qb w - - 0 1)

Watney, Charles Gold

The Observer, 1939

(First published on Sun Feb 12 1939)

3RrB1b/4p3/KprnQ3/1PkN2N1/1p4R1/4p3/B7/6qb

#2

9 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qxd5#
    • 1...Sc4
      • 2.Rxc4#
      • 2.Qxc6#
    • 1...Sxb5
      • 2.Rc4#
    • 1...Sf5
      • 2.Rc4#
      • 2.Qxc6#
    • 1...Sb7
      • 2.Rc4#
      • 2.Qxc6#
    • 1...Sf7
      • 2.Rc4#
      • 2.Qxc6#
    • 1...Sc8
      • 2.Rc4#
      • 2.Qxc6#
  • Tries
    • 1.Qxe3+?
      • 1...Bd4
        • 2.Se6#
      • 1...Qxe3!
    • 1.Qe5?
      • threat
        • 2.Se6#
      • 1...Sxb5
        • 2.Rc4#
      • 1...Sc4
        • 2.Rxc4#
      • 1...Se4
        • 2.Sf6#
      • 1...Sf5
        • 2.Rc4#
      • 1...Sb7
        • 2.Rc4#
      • 1...Sf7
        • 2.Rc4#
      • 1...Sc8
        • 2.Rc4#
      • 1...e6
        • 2.Rc4#
      • 1...Qxg4!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Se6#
      • 1...Sxb5
        • 2.Rc4#
      • 1...Sxf5
        • 2.Rc4#
      • 1...Se4
        • 2.Sf6#
      • 1...Sc4
        • 2.Rxc4#
      • 1...Sb7
        • 2.Rc4#
      • 1...Sf7
        • 2.Rc4#
      • 1...Sc8
        • 2.Rc4#
      • 1...e5
        • 2.Qc2#
      • 1...e6
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • B(b);OGATE,XS(D)::QAR1(G),XB(b)
    • S(h);N_GUARD,P_SPINP(i),XP(C)::R1(B)
  • Tries
    • Try
      • Q(G);CHECK,XP(c)
      • Vars
        • B(k);P_SPINB(k)::S(E)
      • Refutation
        • Q(a);XQ(G)
    • Try
      • Q(G);
      • Threat
        • S(E)
      • Vars
        • S(h);N_GUARD,P_SPINP(i),XP(C)::R1(B)
        • S(h);N_GUARD,P_SPINP(i)::R1(B),XS(h)
        • S(h);P_SPINP(i),S_CUTB(b)::QAR(G)+S(D)
        • S(h);N_GUARD,P_SPINP(i)::R1(B)
        • P(i);P_SPINS(h)::R1(B)
      • Refutation
        • Q(a);XR(B)
  • Actual
    • Q(G);
    • Threat
      • S(E)
    • Vars
      • S(h);N_GUARD,P_SPINP(i),XP(C)::R1(B)
      • S(h);N_GUARD,P_SPINP(i),XQ(G)::R1(B)
      • S(h);N_GUARD,P_SPINP(i),S_CUTB(b)::QAR(G)+S(D)
      • S(h);N_GUARD,P_SPINP(i)::R1(B),XS(h)
      • S(h);N_GUARD,P_SPINP(i)::R1(B)
      • P(i);P_SPINS(h),S_CUTB(k)::QAR(G)
      • P(i);P_SPINS(h)::R1(B)
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