MESON Chess Problem Database

Problem Display
PID: 211094 (Q7/5K2/3pp3/4kpB1/2b5/1NPp1r2/8/8 w - - 0 1)

Walton, FW

The Observer, 1921

(First published on Sun Aug 7 1921)

Q7/5K2/3pp3/4kpB1/2b5/1NPp1r2/8/8

#2

5 + 7

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Bf6#
  • Tries
    • 1.Qxf3?
      • threat
        • 2.Bf4#
        • 2.Bf6#
      • 1...d5
        • 2.Bf4#
        • 2.Qf4#
      • 1...f4!
    • 1.Qh8+?
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd5!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sxf3#
        • 2.Sxc4#
      • 1...f4
        • 2.Qe4#
      • 1...d5
        • 2.Qb8#
      • 1...Rf1
        • 2.Sxc4#
      • 1...Rf2
        • 2.Sxc4#
      • 1...Re3
        • 2.Sxc4#
      • 1...Rg3
        • 2.Sxc4#
      • 1...Rh3
        • 2.Sxc4#
      • 1...Rf4
        • 2.Bf6#
      • 1...Ba2
        • 2.Sxf3#
      • 1...Bb3
        • 2.Sxf3#
      • 1...Bb5
        • 2.Sxf3#
      • 1...Bd5
        • 2.Qh8#
      • 1...Ba6
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK::B(C)
  • Tries
    • Try
      • Q(E);XR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • P(e);
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT::QAR1(E)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • S(A);
    • Threat
      • DUALS(2)
    • Vars
      • P(e);N_GUARD::QAR1(E)
      • P(f);OGATEB,SBLOCK::QAB(E)
      • R(b);::S(A),XB(c)
      • R(b);SBLOCK::B(C)
      • B(c);::S(A),XR(b)
      • B(c);SBLOCK::QAB(E)
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