MESON Chess Problem Database

Problem Display
PID: 152675 (4n3/3R3R/4k3/8/3K1PP1/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2011

4n3/3R3R/4k3/8/3K1PP1/8/8/8

#2

5 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Rh6#
    • 1...Sf6
      • 2.Rhe7#
      • 2.f5#
  • Tries
    • 1.Kc5?
      • 1...Kf6
        • 2.Rh6#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sf6
        • 2.Rd6#
        • 2.Rde7#
        • 2.Rhe7#
      • 1...Sc7
        • 2.Rd6#
      • 1...Sg7!
    • 1.Ra7?
      • 1...Kd6
        • 2.Ra6#
      • 1...Kf6
        • 2.Rh6#
      • 1...Sd6
        • 2.Rh6#
      • 1...Sf6
        • 2.Ra6#
      • 1...Sg7
        • 2.Rh6#
      • 1...Sc7!
    • 1.Rhf7?
      • threat
        • 2.f5#
      • 1...Sd6
        • 2.Rde7#
      • 1...Sg7!
  • Keys
    • 1.Rb7!
      • 1...Kd6
        • 2.Rb6#
      • 1...Kf6
        • 2.Rh6#
      • 1...Sd6
        • 2.Rh6#
      • 1...Sf6
        • 2.Rb6#
      • 1...Sc7
        • 2.Rb6#
      • 1...Sg7
        • 2.Rh6#

Anticipated by 4672(1886), 249051(1947), 132734(1958), 11700(1971), 176200(1976)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::R(E)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::R(E)
        • S(b);N_GUARD::R1(D),XS(b)
        • S(b);N_GUARD::R1(D)
      • Refutation
        • S(b);
    • Try
      • R(D);
      • Vars
        • K(a);P-FLIGHT::R(D)
        • K(a);P-FLIGHT::R(E)
        • S(b);N_GUARD,SBLOCK::R(E)
        • S(b);N_GUARD,SBLOCK::R(D)
        • S(b);N_GUARD::R(E)
      • Refutation
        • S(b);
    • Try
      • R(E);
      • Threat
        • P(B)
      • Vars
        • S(b);SBLOCK::R1(D)
      • Refutation
        • S(b);
  • Actual
    • R(D);
    • Vars
      • K(a);P-FLIGHT::R(D)
      • K(a);P-FLIGHT::R(E)
      • S(b);N_GUARD,SBLOCK::R(E)
      • S(b);N_GUARD,SBLOCK::R(D)
      • S(b);N_GUARD::R(D)
      • S(b);N_GUARD::R(E)
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