MESON Chess Problem Database

Problem Display
PID: 6524 (8/8/8/8/8/N7/b7/kq1QN1K1 w - - 0 1)

Boros, Sandor

Die Schwalbe, 1931

8/8/8/8/8/N7/b7/kq1QN1K1

#2

4 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Bb3
      • 2.Qxb1#
    • 1...Bc4
      • 2.Qxb1#
    • 1...Bd5
      • 2.Qxb1#
    • 1...Be6
      • 2.Qxb1#
    • 1...Bf7
      • 2.Qxb1#
    • 1...Bg8
      • 2.Qxb1#
  • Tries
    • 1.Qc1?
      • threat
        • 2.Sec2#
        • 2.Sac2#
      • 1...Bb3
        • 2.Qxb1#
      • 1...Bc4
        • 2.Qxb1#
      • 1...Bd5
        • 2.Qxb1#
      • 1...Be6
        • 2.Qxb1#
      • 1...Bf7
        • 2.Qxb1#
      • 1...Bg8
        • 2.Qxb1#
      • 1...Qxc1!
  • Keys
    • 1.Qd4+!
      • 1...Qb2
        • 2.Sec2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • B(c);N_GUARD::QAR1(A),XQ(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);N_GUARD::QAR1(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),P_PINS(B),XQ(A)
  • Actual
    • Q(A);CHECK,N_PINQ(b),P_SPINS(B)
    • Vars
      • Q(b);N_PINS(B),P_SPINQ(b)::S(B)
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