MESON Chess Problem Database

Problem Display
PID: 370 (2K5/p1Q2B2/8/3N1pNp/1p1k1r1r/bPR1p3/3q1n2/8 w - - 0 1)

Blake, Percy Francis

The Observer, 1935

(First published on Sun Dec 22 1935)

2K5/p1Q2B2/8/3N1pNp/1p1k1r1r/bPR1p3/3q1n2/8

#2

7 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sf3#
    • 1...Sd3
      • 2.Rc4#
    • 1...Sg4
      • 2.Qxf4#
  • Tries
    • 1.Qxf4+?
      • 1...Se4
        • 2.Sf3#
      • 1...Rxf4!
    • 1.Qb6+?
      • 1...Ke5
        • 2.Qf6#
      • 1...axb6!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qf6#
      • 1...Qxc3+
        • 2.Sc7#
      • 1...bxc3
        • 2.Sb4#
      • 1...Re4
        • 2.Sf3#
      • 1...Sd3
        • 2.Rc4#
      • 1...Se4
        • 2.Se6#
      • 1...Sg4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(g);N_GUARD,SBLOCK::S(D)
    • S(b);SBLOCK::R1(B)
    • S(b);N_GUARD,S_CUTR(h)::QAR2(E),XR(g)
  • Tries
    • Try
      • Q(E);CHECK,XR(g)
      • Vars
        • S(b);P_SPINS(b)::S(D)
      • Refutation
        • R(h);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB1(E)
      • Refutation
        • P(k);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)
    • Vars
      • Q(a);CHECK,SBLOCK,XR(B)::QAR(E)+S(C)
      • P(e);SBLOCK,XR(B)::QAR(E)+S(C)
      • R(g);N_GUARD,SBLOCK::S(D)
      • S(b);SBLOCK::R1(B)
      • S(b);SBLOCK::S(D)
      • S(b);N_GUARD,S_CUTR(h)::QAR2(E),XR(g)
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