MESON Chess Problem Database

Problem Display
PID: 199863 (n6b/B7/1r1p4/1Nk5/3p3Q/1R1P4/nK2N1B1/8 w - - 0 1)

Watts, William

The Observer, 1946

(First published on Sun Sep 29 1946)

n6b/B7/1r1p4/1Nk5/3p3Q/1R1P4/nK2N1B1/8

#2

8 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qg5+?
      • 1...d5
        • 2.Qxd5#
      • 1...Be5!
    • 1.Qe4?
      • threat
        • 2.Qd5#
        • 2.Qc6#
      • 1...d5
        • 2.Qxd5#
      • 1...Sc3
        • 2.Qc6#
      • 1...Sc7
        • 2.Qc6#
      • 1...Sb4!
    • 1.Qh5+?
      • 1...d5
        • 2.Qxd5#
      • 1...Be5!
  • Keys
    • 1.Sbxd4!
      • threat
        • 2.Rb5#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...d5
        • 2.Qe7#
      • 1...Sc3
        • 2.Se6#
      • 1...Sb4
        • 2.Rc3#
      • 1...Sc7
        • 2.Bxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAR1(F),XP(e)
      • Refutation
        • B(g);P_SPINB(g)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);::QAR1(F),XP(e)
        • S(a);::QAR1(F)
        • S(f);::QAR1(F)
      • Refutation
        • S(a);
    • Try
      • Q(F);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAR1(F),XP(e)
      • Refutation
        • B(g);P_SPINB(g)
  • Actual
    • S(G);P_SPINR(D),P_SPINS(G),XP(b)
    • Threat
      • R1(D)
    • Vars
      • B(g);CHECK,OGATE,XS(G)::QAB1(F),XB(g)
      • P(e);OGATEB::QAB(F)
      • S(a);N_PINS(G)::S(G)
      • S(a);N_PINR(D),SBLOCK::R(D)
      • S(f);N_GUARD::B(H),XR(d)
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