MESON Chess Problem Database

Problem Display
PID: 103113 (6n1/nK1ppb2/2P1k3/6R1/2N1P3/8/B3Rp2/B7 w - - 0 1)

MacDougall, Randall

Northwest Chess, 1977

6n1/nK1ppb2/2P1k3/6R1/2N1P3/8/B3Rp2/B7

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Re5#
    • 1...d5
      • 2.exd5#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Sd6#
      • 1...Sf6
        • 2.Re5#
      • 1...d5
        • 2.exd5#
      • 1...d6
        • 2.Sxd6#
      • 1...Sb5+!
  • Keys
    • 1.e5!
      • threat
        • 2.Sd6#
      • 1...Kd5
        • 2.e6#
      • 1...dxc6
        • 2.Sb6#
      • 1...d5
        • 2.exd5 ep#
      • 1...Sf6
        • 2.exf6#
      • 1...d6
        • 2.Sxd6#
        • 2.exd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(g);SBLOCK::R1(F)
    • P(d);OGATE::R(C)+P(E)DCHECK,XP(d)
  • Tries
    • Try
      • K(H);P-FLIGHT
      • Threat
        • B(B)+S(D)
      • Vars
        • S(g);SBLOCK::R1(F)
        • P(d);OGATE::R(C)+P(E)DCHECK,XP(d)
        • P(d);::B(B)+S(D),XP(d)
      • Refutation
        • S(c);CHECK
  • Actual
    • P(E);
    • Threat
      • B(B)+S(D)
    • Vars
      • K(b);OGATE,S_FLIGHT::R(F)+P(E)
      • P(d);N_GUARD,XP(G)::B(B)+S(D)
      • P(d);OGATE::R(C)+P(E),XP(d),EP
      • S(g);OGATE::R(C)+P(E),XS(g)
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