MESON Chess Problem Database

Problem Display
PID: 194312 (b1r3R1/1n4Bp/r7/7p/8/3Bpp1K/7R/QN3Nk1 w - - 0 1)

Byas, Walter

The Observer, 1940

(First published on Sun Apr 21 1940)

b1r3R1/1n4Bp/r7/7p/8/3Bpp1K/7R/QN3Nk1

#2

8 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa1
      • 2.Bf8#
    • 1...Ra3
      • 2.Bf8#
    • 1...Ra7
      • 2.Bf8#
    • 1...Rc1
      • 2.Bf6#
    • 1...Rc3
      • 2.Bf6#
    • 1...Rc6
      • 2.Bf6#
    • 1...Sd6
      • 2.Bf8#
    • 1...Sd8
      • 2.Bf6#
  • Tries
    • 1.Rg2+?
      • 1...Kh1
        • 2.Sg3#
      • 1...fxg2!
  • Keys
    • 1.Sfd2!
      • threat
        • 2.Sxf3#
      • 1...exd2
        • 2.Bd4#
      • 1...Rf6
        • 2.Sc3#
      • 1...Rf8
        • 2.Sa3#
      • 1...Sa5
        • 2.Sc3#
      • 1...Sc5
        • 2.Sa3#
      • 1...Sd6
        • 2.Bf8#
      • 1...Sd8
        • 2.Bf6#
      • 1...e2
        • 2.Bd4#
      • 1...f2
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 6
  • Sets
    • R(e);N_GUARD,XQ(A)::R(H)+B(G)
    • R(e);N_GUARD::R(H)+B(G)
    • R(i);N_GUARD::R(H)+B(G)
    • S(f);S_CUTR(e)::R(H)+B(G)
    • S(f);S_CUTR(i)::R(H)+B(G)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • P(c);XR(D)
  • Actual
    • S(C);
    • Threat
      • S(C),XP(c)
    • Vars
      • P(b);XS(C)::R(H)+B(G),DCHECK
      • R(e);N_GUARD::QAR(A)+S(B)
      • R(i);N_GUARD::QAR(A)+S(B)
      • S(f);S_CUTR(e)::QAR(A)+S(B)
      • S(f);S_CUTR(i)::QAR(A)+S(B)
      • S(f);S_CUTR(e)::R(H)+B(G)
      • S(f);S_CUTR(i)::R(H)+B(G)
      • P(b);::R(H)+B(G),DCHECK
      • P(c);::S(C)
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