MESON Chess Problem Database

Problem Display
PID: 116353 (4B3/5Q1P/8/3p4/2PpPP2/3k4/PP4N1/R3K1N1 w Q - 0 1)

Hermanson, Halvar

Canadian Chess Chat, 1981

4B3/5Q1P/8/3p4/2PpPP2/3k4/PP4N1/R3K1N1

#2

12 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qg6#
    • 1...dxe4
      • 2.0-0-0#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Qe2#
      • 1...Kc2
        • 2.Qe2#
      • 1...Kxe4
        • 2.Bg6#
        • 2.Qg6#
      • 1...Kxc4!
    • 1.0-0-0+?
      • 1...Kxe4
        • 2.Qxd5#
        • 2.Qe6#
        • 2.Qg6#
      • 1...Kxc4!
  • Keys
    • 1.Qb7!
      • 1...Kc2
        • 2.Qb3#
      • 1...Kxc4
        • 2.Qb5#
      • 1...Kxe4
        • 2.Bg6#
      • 1...dxc4
        • 2.0-0-0#
      • 1...dxe4
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,S_FLIGHT,XP(H)::QAB(J)
    • P(c);SBLOCK,XP(H)::0-0-0
  • Tries
    • Try
      • Q(J);
      • Threat
        • QAB1(J)
      • Vars
        • K(a);S_FLIGHT::QAR2(J)
      • Refutation
        • K(a);S_FLIGHT,XP(G)
    • Try
      • K(B);0-0-0,CHECK
      • Refutation
        • K(a);P_SPINP(c),S_FLIGHT,XP(G)
  • Actual
    • Q(J);
    • Vars
      • K(a);S_FLIGHT::QAB1(J)
      • K(a);OGATEB,S_FLIGHT,XP(G)::QAB1(J)
      • K(a);OGATEB,P_SPINP(c),S_FLIGHT,XP(H)::B(L)
      • P(c);SBLOCK,XP(G)::0-0-0
      • P(c);SBLOCK,XP(H)::QAR2(J)
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