MESON Chess Problem Database

Problem Display
PID: 513 (3n4/2p5/2p2K2/2p2P2/3kpN2/Q3Np2/8/8 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1957

3n4/2p5/2p2K2/2p2P2/3kpN2/Q3Np2/8/8

#2

5 + 7

5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Sxe6#
    • 1...Sb7
      • 2.Se6#
    • 1...Sf7
      • 2.Se6#
    • 1...f2
      • 2.Se2#
    • 1...c4
      • 2.Sc2#
  • Tries
    • 1.Sed5?
      • threat
        • 2.Qc3#
      • 1...Kc4
        • 2.Qa4#
      • 1...e3
        • 2.Qd3#
      • 1...c4
        • 2.Qe3#
      • 1...cxd5!
    • 1.Qa5?
      • threat
        • 2.Qd2#
      • 1...c4
        • 2.Sc2#
      • 1...Kxe3!
  • Keys
    • 1.Sd1!
      • threat
        • 2.Qc3#
      • 1...Kc4
        • 2.Qa4#
      • 1...e3
        • 2.Qd3#
      • 1...c4
        • 2.Qe3#

This anticipates 46561(2003)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(g);N_GUARD::S(C),XS(g)
    • S(g);N_GUARD::S(C)
    • P(a);N_GUARD::S(C)
    • P(d);SBLOCK::S(B)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
        • P(d);SBLOCK::QAB1(A)
      • Refutation
        • P(e);XS(B)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • P(d);SBLOCK::S(B)
      • Refutation
        • K(b);S_FLIGHT,XS(B)
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • P(c);N_GUARD::QAR1(A)
      • P(d);SBLOCK::QAB1(A)
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