MESON Chess Problem Database

Problem Display
PID: 188616 (8/r3pN1K/1RP2k2/2B2pNP/3p3Q/5R2/2p1rnp1/b4q2 w - - 0 1)

Evans, TC

The Observer, 1938

(First published on Sun Jan 23 1938)

8/r3pN1K/1RP2k2/2B2pNP/3p3Q/5R2/2p1rnp1/b4q2

#2

9 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Rxf4#
      • 2.Qxf4#
    • 1...e5
      • 2.c7#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qxf5#
      • 1...Re5
        • 2.Qxe5#
      • 1...e6!
    • 1.c7+?
      • 1...Re6
        • 2.Rxe6#
      • 1...e6!
  • Keys
    • 1.Sh6!
      • threat
        • 2.Rxf5#
      • 1...e5+
        • 2.c7#
      • 1...e6+
        • 2.Sgf7#
      • 1...Ke5
        • 2.Rxf5#
      • 1...Re5
        • 2.Sg8#
      • 1...Sd1
        • 2.Sg4#
      • 1...Sh1
        • 2.Sg4#
      • 1...Sd3
        • 2.Sg4#
      • 1...Sh3
        • 2.Sg4#
      • 1...Se4
        • 2.Sg4#
      • 1...Sg4
        • 2.Sxg4#
      • 1...f4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • P(k);N_GUARD,P_PINS(H),S_CUTR(d)::R(F)+P(G)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(h)
      • Vars
        • R(d);N_GUARD::QAB1(B),XR(d)
      • Refutation
        • P(k);P_PINS(H)
    • Try
      • P(G);CHECK
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::R1(F),XR(d)
      • Refutation
        • P(k);
  • Actual
    • S(H);
    • Threat
      • R1(A),XP(h)
    • Vars
      • P(k);CHECK,N_GUARD,SBLOCK,S_CUTR(d)::R(F)+P(G)
      • P(k);CHECK,SBLOCK::QAB(B)+S(D)
      • K(i);N_SPINP(h),S_FLIGHT::R1(A),XP(h)
      • R(d);SBLOCK::S(H)
      • S(e);N_GUARD::S(H)
      • S(e);N_GUARD::S(H),XS(e)
      • P(h);OGATEB::QAR2(B),XP(h)
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