MESON Chess Problem Database

Problem Display
PID: 37646 (B3R3/b3NQPp/q3nB1K/1p1N4/1R1pkP2/2P5/4P3/8 w - - 0 1)

Hannelius, Jan Ingvar

The Problemist, 1953

B3R3/b3NQPp/q3nB1K/1p1N4/1R1pkP2/2P5/4P3/8

#2

12 + 7

3105 FIDE Album (1945-1955) 1964

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Qxe6#
    • 1...Qa1
      • 2.Qxe6#
    • 1...Qa2
      • 2.Qxe6#
    • 1...Qa3
      • 2.Qxe6#
    • 1...Qa4
      • 2.Qxe6#
    • 1...Qa5
      • 2.Qxe6#
    • 1...Bb6
      • 2.Qxe6#
    • 1...Sc5
      • 2.Rxd4#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Qf3#
        • 2.Qh1#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Sxf4
        • 2.Qf3#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Sxg7
        • 2.Qf3#
        • 2.Qh1#
        • 2.Qe5#
      • 1...Qa1
        • 2.Qf3#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Qd6
        • 2.Qf3#
        • 2.Qh1#
        • 2.Qf5#
      • 1...Bb8
        • 2.Qf3#
        • 2.Qh1#
        • 2.Qf5#
      • 1...Sg5!
  • Keys
    • 1.Bxd4!
      • threat
        • 2.Qf5#
      • 1...Sxd4+
        • 2.Sc6#
      • 1...Sxf4+
        • 2.Sf6#
      • 1...Sc5+
        • 2.Bf6#
      • 1...Sg5+
        • 2.Bb6#
      • 1...Sc7+
        • 2.Bb6#
      • 1...Sxg7+
        • 2.Bb6#
      • 1...Sd8+
        • 2.Bb6#
      • 1...Sf8+
        • 2.Bb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 7
  • Sets
    • Q(d);N_GUARD::QAR2(I),XS(e)
    • B(f);S_CUTQ(d)::QAR2(I),XS(e)
    • S(e);N_GUARD,P_PINB(F),S_CUTB(f)::R1(C),XP(a)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(4)
      • Refutation
        • S(e);P_PINB(F)
  • Actual
    • B(F);XP(a)
    • Threat
      • QAB1(I)
    • Vars
      • S(e);CHECK,P_SPINS(e),XB(F)::R(L)+S(H)
      • S(e);CHECK,SBLOCK,XP(D)::B(K)+S(E),DCHECK
      • S(e);CHECK,N_GUARD,S_CUTB(f)::R(C)+B(F)
      • S(e);CHECK,N_GUARD::R(C)+B(F)
      • S(e);CHECK,N_GUARD,XP(J)::R(C)+B(F)
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