MESON Chess Problem Database

Problem Display
PID: 270715 (4Q2n/6B1/1K1p4/1p1k2n1/5p1r/2Rp3r/8/3N3b w - - 0 1)

Eddy, Edwin John

The Observer, 1959

(First published on Sun Jun 28 1959)

4Q2n/6B1/1K1p4/1p1k2n1/5p1r/2Rp3r/8/3N3b

#2

5 + 10

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Qc6#
      • 2.Qa8#
    • 1...f3
      • 2.Se3#
  • Tries
    • 1.Rxd3+?
      • 1...Kc4
        • 2.Qxb5#
      • 1...Rxd3!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Rd4#
      • 1...Kxc4
        • 2.Qxb5#
      • 1...bxc4
        • 2.Sc3#
      • 1...Sf3
        • 2.Qe4#
      • 1...Se6
        • 2.Qc6#
      • 1...f3
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(d);N_GUARD,S_CUTR(c)::S(A)
  • Tries
    • Try
      • R(B);CHECK,XP(b)
      • Vars
        • K(g);N_GUARD,S_FLIGHT::QAB1(E),XP(f)
      • Refutation
        • R(c);XR(B)
  • Actual
    • R(B);
    • Threat
      • R1(B)
    • Vars
      • K(g);N_GUARD,S_FLIGHT,XR(B)::QAB1(E),XP(f)
      • P(f);SBLOCK,XR(B)::S(A)
      • S(h);N_GUARD,S_CUTB(a)::QAB1(E)
      • S(h);SBLOCK::QAB1(E)
      • P(d);N_GUARD,S_CUTR(c)::S(A)
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