MESON Chess Problem Database

Problem Display
PID: 186212 (8/1Np4B/K1Nb3n/p6r/2k2P1p/1p1R4/P1p2p2/2n2Q2 w - - 0 1)

Evans, TC

The Observer, 1932

(First published on Sun Dec 11 1932)

8/1Np4B/K1Nb3n/p6r/2k2P1p/1p1R4/P1p2p2/2n2Q2

#2

8 + 11

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bc5
      • 2.Sbxa5#
    • 1...Se2
      • 2.axb3#
    • 1...Sxd3
      • 2.Qxd3#
    • 1...Sf5
      • 2.Bg8#
  • Tries
    • 1.Sbxa5+?
      • 1...Kc5
        • 2.Qxf2#
      • 1...Rxa5+!
    • 1.Rc3+?
      • 1...Kd5
        • 2.Qc4#
      • 1...Kxc3!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Rd4#
      • 1...Sxd3
        • 2.Qxd3#
      • 1...Se2
        • 2.axb3#
      • 1...Rd5
        • 2.Rc3#
      • 1...Bc5
        • 2.Sbxa5#
      • 1...Be5
        • 2.Qe6#
      • 1...Sf5
        • 2.Bg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(i);SBLOCK,S_CUTR(h)::S(G),XP(g)
    • S(a);N_GUARD::P(B),XP(d)
    • S(a);OGATE,P_SPINS(a),XR(C)::QAB1(A),XS(a)
    • S(j);N_GUARD,S_CUTR(h)::B(H)
  • Tries
    • Try
      • S(G);CHECK,XP(g)
      • Vars
        • K(e);P-FLIGHT::QAB(A),XP(c)
      • Refutation
        • R(h);CHECK,XS(G)
    • Try
      • R(C);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB1(A)
      • Refutation
        • K(e);P-FLIGHT,XR(C)
  • Actual
    • Q(A);
    • Threat
      • R1(C)
    • Vars
      • S(a);OGATE,XR(C)::QAB1(A),XS(a)
      • S(a);N_GUARD::P(B),XP(d)
      • R(h);SBLOCK::R1(C)
      • B(i);SBLOCK,S_CUTR(h)::S(G),XP(g)
      • B(i);S_CUTR(h)::QAB(A)
      • S(j);N_GUARD,S_CUTR(h)::B(H)
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