MESON Chess Problem Database

Problem Display
PID: 242864 (b7/4n3/4Qb2/6p1/1B1k4/4N3/2P2P1R/K7 w - - 0 1)

Degener, Udo

Themes-64, 1979

b7/4n3/4Qb2/6p1/1B1k4/4N3/2P2P1R/K7

#2

7 + 5

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qc4#
    • 1...Be4
      • 2.Qxf6#
    • 1...Sf5
      • 2.Sxf5#
    • 1...Sc6
      • 2.Sf5#
      • 2.Qd5#
    • 1...Sg6
      • 2.Sf5#
    • 1...Sc8
      • 2.Sf5#
    • 1...Sg8
      • 2.Sf5#
  • Tries
    • 1.f4?
      • threat
        • 2.Rd2#
      • 1...Be5
        • 2.Qxe5#
      • 1...Be4
        • 2.Qb6#
      • 1...Bg2!
  • Keys
    • 1.f3!
      • threat
        • 2.Rd2#
      • 1...Be5
        • 2.Qb6#
      • 1...Be4
        • 2.Qxe4#

Anticipated by 95730(1957)

This anticipates 86748(1992)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • B(c);SBLOCK::QAR1(G)
    • B(e);SBLOCK::QAB(G),XB(c)
    • S(d);N_GUARD::S(E),XS(d)
    • S(d);N_GUARD::S(E)
  • Tries
    • Try
      • P(C);
      • Threat
        • R(D)
      • Vars
        • B(c);N_GUARD::QAB1(G),XB(c)
        • B(e);SBLOCK::QAB(G)
      • Refutation
        • B(e);
  • Actual
    • P(C);
    • Threat
      • R(D)
    • Vars
      • B(c);SBLOCK::QAB(G)
      • B(e);N_GUARD::QAR1(G),XB(e)
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