MESON Chess Problem Database

Problem Display
PID: 108384 (8/4q3/1R1p4/p7/k5B1/3p4/1P2p3/nK2Q3 w - - 0 1)

Harel, Roger

Le Havre Eclair, 1927

8/4q3/1R1p4/p7/k5B1/3p4/1P2p3/nK2Q3

#2

5 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Bd7#
    • 1...Qf6
      • 2.Bd7#
    • 1...Qf8
      • 2.Bd7#
    • 1...Qe3
      • 2.Bd7#
    • 1...Qd7
      • 2.Bxd7#
  • Tries
    • 1.b3+?
      • 1...Ka3
        • 2.Qxa5#
        • 2.Qc1#
      • 1...Sxb3!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Bd7#
      • 1...e1Q+
        • 2.Bd1#
      • 1...e1R+
        • 2.Bd1#
      • 1...Qe6
        • 2.Bxe6#
      • 1...Qd7
        • 2.Bf5#
        • 2.Be6#
        • 2.Bxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::B(D)
    • Q(g);N_GUARD::B(D),XQ(g)
  • Tries
    • Try
      • P(C);CHECK
      • Refutation
        • S(a);XP(C)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+B(D),DCHECK
    • Vars
      • P(b);CHECK,OGATE::QAR(B)+B(D),DCHECK
      • Q(g);N_GUARD::QAR(B)+B(D),XQ(g)
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