MESON Chess Problem Database

Problem Display
PID: 185047 (B7/b2N3p/rp2R1pr/p2N3p/P2k3P/1P1p4/n2B2n1/3K4 w - - 0 1)

Evans, TC

The Observer, 1930

(First published on Sun Mar 9 1930)

B7/b2N3p/rp2R1pr/p2N3p/P2k3P/1P1p4/n2B2n1/3K4

#2

9 + 12

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Bc3#
    • 1...Sc3+
      • 2.Bxc3#
    • 1...Sb4
      • 2.Bc3#
    • 1...Se1
      • 2.Be3#
    • 1...Se3+
      • 2.Bxe3#
    • 1...Sf4
      • 2.Be3#
    • 1...Sxh4
      • 2.Be3#
  • Keys
    • 1.Rd6!
      • threat
        • 2.Sc3#
        • 2.Se3#
        • 2.Sb4#
        • 2.Sf4#
        • 2.S5xb6#
        • 2.S5f6#
        • 2.Sc7#
        • 2.Se7#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...Se3+
        • 2.Sxe3#
      • 1...Ke4
        • 2.Se7#
      • 1...Bb8
        • 2.Sc7#
      • 1...Sb4
        • 2.Sxb4#
      • 1...Sf4
        • 2.Sxf4#
      • 1...b5
        • 2.S5b6#
      • 1...g5
        • 2.S5f6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::B(B)
    • S(a);CHECK,N_GUARD::B(B),XS(a)
    • S(b);N_GUARD::B(B)
    • S(b);CHECK,N_GUARD::B(B),XS(b)
    • S(b);N_GUARD,XP(E)::B(B)
  • Actual
    • R(G);
    • Threat
      • DUALS(8)
    • Vars
      • S(a);CHECK::R(G)+S(F),XS(a)
      • S(b);CHECK::R(G)+S(F),XS(b)
      • K(d);P-FLIGHT::B(I)+S(F)
      • B(k);::R(G)+S(F)
      • S(a);::R(G)+S(F),XS(a)
      • S(b);::R(G)+S(F),XS(b)
      • P(h);::R(G)+S(F)
      • P(i);::R(G)+S(F)
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