MESON Chess Problem Database

Problem Display
PID: 187292 (3Q3b/5B1b/Kppp4/2k1pp2/np6/8/1B1NN1p1/n7 w - - 0 1)

Evans, TC

The Observer, 1935

(First published on Sun Mar 10 1935)

3Q3b/5B1b/Kppp4/2k1pp2/np6/8/1B1NN1p1/n7

#2

6 + 12

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Sb3#
    • 1...Sb3
      • 2.Sxb3#
    • 1...Sxb2
      • 2.Qxb6#
    • 1...Sc3
      • 2.Qxb6#
    • 1...b3
      • 2.Ba3#
    • 1...d5
      • 2.Qe7#
      • 2.Qf8#
  • Tries
    • 1.Bxa1?
      • threat
        • 2.Sb3#
      • 1...d5
        • 2.Qe7#
        • 2.Qf8#
      • 1...b3!
    • 1.Bxe5?
      • threat
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...dxe5
        • 2.Qe7#
        • 2.Qf8#
      • 1...d5
        • 2.Bd6#
        • 2.Qe7#
        • 2.Qd6#
        • 2.Qf8#
      • 1...Bxe5!
    • 1.Qh4?
      • threat
        • 2.Qf2#
        • 2.Qc4#
      • 1...Sxb2
        • 2.Qf2#
      • 1...d5
        • 2.Qe7#
      • 1...g1Q
        • 2.Qc4#
      • 1...g1B
        • 2.Qc4#
      • 1...Sc2
        • 2.Sb3#
        • 2.Qc4#
      • 1...Sb3
        • 2.Sxb3#
        • 2.Qc4#
      • 1...b3
        • 2.Ba3#
        • 2.Qc4#
      • 1...f4
        • 2.Qf2#
      • 1...b5
        • 2.Qf2#
      • 1...e4!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qe3#
      • 1...b3
        • 2.Ba3#
      • 1...d5
        • 2.Qe7#
      • 1...g1Q
        • 2.Qxg1#
      • 1...g1B
        • 2.Qxg1#
      • 1...Sc2
        • 2.Sb3#
      • 1...Sb3
        • 2.Sxb3#
      • 1...e4
        • 2.Sxe4#
      • 1...f4
        • 2.Bd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::S(B)
    • S(a);N_GUARD::S(B),XS(a)
    • S(c);N_GUARD,XB(A)::QAB1(F),XP(h)
    • S(c);N_GUARD::QAB1(F),XP(h)
    • P(d);OGATEB::B(A)
  • Tries
    • Try
      • B(A);XS(a)
      • Threat
        • S(B)
      • Refutation
        • P(d);
    • Try
      • B(A);XP(f)
      • Threat
        • DUALS(2)
      • Refutation
        • B(l);XB(A)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);XB(A)::QAB(F)
        • P(j);OGATEB::QAB(F)
        • P(b);::QAR1(F)
        • P(g);::QAB(F)
        • P(h);::QAB(F)
      • Refutation
        • P(f);
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • P(d);OGATEB::B(A)
      • P(j);OGATEB::QAB(F)
      • P(b);OGATE::QAB(F),XQ(b)
      • P(b);OGATE::QAB(F),XB(b)
      • S(a);N_GUARD::S(B)
      • S(a);N_GUARD::S(B),XS(a)
      • P(f);P_SPINP(g)::S(B),XP(f)
      • P(g);P_SPINP(f)::B(A)
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