MESON Chess Problem Database

Problem Display
PID: 188342 (1B6/1prp2K1/3k2N1/1Q1b2N1/3pp1B1/1p6/8/2r5 w - - 0 1)

Evans, TC

The Observer, 1937

(First published on Sun Apr 18 1937)

1B6/1prp2K1/3k2N1/1Q1b2N1/3pp1B1/1p6/8/2r5

#2

6 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qxd7#
    • 1...Bc4
      • 2.Sxe4#
    • 1...Bc6
      • 2.Sf7#
      • 2.Qe5#
    • 1...Be6
      • 2.Sxe4#
    • 1...Bf7
      • 2.Sxe4#
      • 2.Sxf7#
    • 1...Bg8
      • 2.Sxe4#
  • Tries
    • 1.Qb4+?
      • 1...Kc6
        • 2.Se5#
        • 2.Se7#
      • 1...Rc5!
    • 1.Qb6+?
      • 1...Rc6
        • 2.Bxc7#
      • 1...Bc6!
  • Keys
    • 1.Be6!
      • threat
        • 2.Qxd5#
      • 1...dxe6+
        • 2.Sf7#
      • 1...Bxe6
        • 2.Sxe4#
      • 1...Rc5
        • 2.Qxd7#
      • 1...Bc4
        • 2.Qb6#
      • 1...Bc6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(a);SBLOCK::QAR1(B),XP(i)
    • B(e);N_GUARD::S(C),XP(d)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • R(a);N_SPINR(h),P_SPINR(a)
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_SPINR(h),P_SPINR(a)::B(F),XR(h)
      • Refutation
        • B(e);P_SPINB(e)
  • Actual
    • B(A);
    • Threat
      • QAR1(B),XB(e)
    • Vars
      • P(i);CHECK,SBLOCK,XB(A)::S(C)
      • B(e);N_GUARD,SBLOCK,XB(A)::S(C),XP(d)
      • R(a);SBLOCK::QAR1(B),XP(i)
      • B(e);N_GUARD,S_CUTR(a)::QAR2(B)
      • B(e);OGATE,SBLOCK::QAB1(B)
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