MESON Chess Problem Database

Problem Display
PID: 187139 (3r4/1B6/1B1pbrp1/3P4/R5N1/1K1QPk2/4N1p1/7n w - - 0 1)

Evans, TC

The Observer, 1934

(First published on Sun Oct 21 1934)

3r4/1B6/1B1pbrp1/3P4/R5N1/1K1QPk2/4N1p1/7n

#2

9 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Rxf4#
    • 1...Bxg4
      • 2.e4#
    • 1...Bxd5+
      • 2.Bxd5#
    • 1...Bf5
      • 2.Rf4#
    • 1...Sf2
      • 2.Sh2#
    • 1...Sg3
      • 2.Sg1#
  • Keys
    • 1.Ba6!
      • threat
        • 2.Qe4#
      • 1...Bxd5+
        • 2.Qxd5#
      • 1...Bxg4
        • 2.e4#
      • 1...Rf4
        • 2.Rxf4#
      • 1...Bf5
        • 2.Rf4#
      • 1...Sf2
        • 2.Sh2#
      • 1...Sg3
        • 2.Sg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD::R1(E),XR(f)
    • B(e);N_PINP(G),SBLOCK,XS(F)::QAR(C)+P(D)
    • B(e);CHECK,OGATE,P_SPINB(e),XP(G)::B(I),XB(e)
    • B(e);N_PINP(G),S_CUTR(f)::R1(E)
    • S(a);SBLOCK::S(F)
    • S(a);SBLOCK::S(A)
  • Actual
    • B(I);
    • Threat
      • QAB1(C)
    • Vars
      • B(e);CHECK,OGATE,XP(G)::QAB(C),XB(e)
      • B(e);N_PINP(G),SBLOCK,XS(F)::QAR(C)+P(D)
      • R(f);N_GUARD::R1(E),XR(f)
      • B(e);N_PINP(G),S_CUTR(f)::R1(E)
      • S(a);SBLOCK::S(F)
      • S(a);SBLOCK::S(A)
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