MESON Chess Problem Database

Problem Display
PID: 192801 (8/2p4K/pr3b2/q2p1Qpp/2Pk4/N2N3R/n2B4/8 w - - 0 1)

Evans, TC

The Observer, 1939

(First published on Sun Oct 8 1939)

8/2p4K/pr3b2/q2p1Qpp/2Pk4/N2N3R/n2B4/8

#2

7 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Be3#
      • 2.Qxd5#
    • 1...Qb4
      • 2.Qxd5#
    • 1...Qxa3
      • 2.Qxd5#
    • 1...Qa4
      • 2.Qxd5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Be7
      • 2.Qe5#
    • 1...Bd8
      • 2.Qe5#
    • 1...Sc3
      • 2.Be3#
    • 1...dxc4
      • 2.Sc2#
    • 1...g4
      • 2.Qf4#
    • 1...h4
      • 2.Qg4#
    • 1...c5
      • 2.Qxd5#
  • Tries
    • 1.Qxf6+?
      • 1...Ke4
        • 2.Sf2#
        • 2.Re3#
        • 2.Qe5#
      • 1...Rxf6!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Qxc5
        • 2.Rd3#
      • 1...dxc4
        • 2.Sc2#
      • 1...Rd6
        • 2.Sb3#
      • 1...Be5
        • 2.Qf2#
      • 1...Sc3
        • 2.Be3#
      • 1...Sb4
        • 2.Sb3#
      • 1...c6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::QAR1(F),XP(d)
    • Q(c);N_GUARD,XS(B)::QAR1(F),XP(d)
    • B(i);N_GUARD::QAB1(F),XB(i)
    • B(i);N_GUARD::QAB1(F)
    • S(a);SBLOCK::B(A)
    • P(d);SBLOCK,XP(E)::S(B)
    • P(e);N_GUARD::QAR2(F)
    • P(f);N_GUARD::QAR(F)
    • P(j);S_CUTQ(c)::QAR1(F),XP(d)
  • Tries
    • Try
      • Q(F);CHECK,XB(i)
      • Refutation
        • R(h);XQ(F)
  • Actual
    • S(C);
    • Threat
      • QAR1(F),XP(d)
    • Vars
      • K(b);P_SPINP(d),S_FLIGHT,XS(C)::QAR1(F),XP(d)
      • Q(c);SBLOCK,XS(C)::R1(D)
      • P(d);SBLOCK,XP(E)::S(B)
      • R(h);N_GUARD::S(C)
      • B(i);SBLOCK::QAB(F)
      • S(a);SBLOCK::B(A)
      • S(a);S_CUTR(h)::S(C)
      • P(j);S_CUTR(h)::S(C)
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