MESON Chess Problem Database

Problem Display
PID: 102297 (1bN1R3/3p3N/4q3/4k3/3pB1R1/B7/8/4K3 w - - 0 1)

Nielsen, A

Dagbladet, 1974

1bN1R3/3p3N/4q3/4k3/3pB1R1/B7/8/4K3

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Rxe7#
    • 1...Bd6
      • 2.Bxd6#
    • 1...Ba7
      • 2.Bd6#
    • 1...d3
      • 2.Bb2#
  • Tries
    • 1.Se7?
      • threat
        • 2.Sg6#
      • 1...Qxe7
        • 2.Rxe7#
      • 1...Qg6
        • 2.Sc6#
        • 2.Sxg6#
      • 1...d3!
    • 1.Bf8?
      • threat
        • 2.Bg7#
      • 1...Qe7
        • 2.Rxe7#
      • 1...Qxe8!
  • Keys
    • 1.Be7!
      • threat
        • 2.Bf6#
      • 1...Qxg4
        • 2.Bd6#
      • 1...Qxe7
        • 2.Rxe7#
      • 1...Qf6
        • 2.Bd6#
        • 2.Bxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(c);OGATEB::R(G),XQ(c)
    • B(e);N_GUARD::B(B),XB(e)
    • B(e);N_GUARD::B(B)
    • P(a);OGATEB::B(B)
  • Tries
    • Try
      • S(F);N_PINQ(c)
      • Threat
        • S(F)
      • Vars
        • Q(c);OGATE,P_SPINQ(c),XS(F)::R(G),XQ(c)
      • Refutation
        • P(a);
    • Try
      • B(B);
      • Threat
        • B(B)
      • Vars
        • Q(c);OGATEB::R(G),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XR(G)
  • Actual
    • B(B);N_PINQ(c)
    • Threat
      • B(B)
    • Vars
      • Q(c);XR(D)::R(G)+B(B),DCHECK
      • Q(c);OGATE,P_SPINQ(c),XB(B)::R(G),XQ(c)
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