MESON Chess Problem Database

Problem Display
PID: 90262 (8/8/8/8/8/K7/5P2/kbn2Q1R w - - 0 1)

Kniest, Alfred

Die Schwalbe, 1930

8/8/8/8/8/K7/5P2/kbn2Q1R

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qxb1#
    • 1...Se2
      • 2.Qxb1#
    • 1...Sb3
      • 2.Qxb1#
    • 1...Sd3
      • 2.Qxb1#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qb2#
        • 2.Qe5#
      • 1...Ba2
        • 2.Qb2#
      • 1...Bc2
        • 2.Qb2#
      • 1...Bd3
        • 2.Qb2#
      • 1...Be4
        • 2.Qb2#
      • 1...Bf5
        • 2.Qb2#
      • 1...Bg6
        • 2.Qb2#
      • 1...Bh7
        • 2.Qb2#
      • 1...Sa2
        • 2.Rxb1#
        • 2.Qxb1#
        • 2.Qb2#
      • 1...Se2
        • 2.Rxb1#
        • 2.Qxb1#
        • 2.Qb2#
      • 1...Sd3
        • 2.Rxb1#
        • 2.Qxb1#
      • 1...Sb3!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qc3#
        • 2.Qd4#
      • 1...Ba2
        • 2.Qxa2#
      • 1...Bc2
        • 2.Qa2#
      • 1...Bd3
        • 2.Qa2#
      • 1...Be4
        • 2.Qa2#
      • 1...Bf5
        • 2.Qa2#
      • 1...Bg6
        • 2.Qa2#
      • 1...Bh7
        • 2.Qa2#
      • 1...Sa2
        • 2.Qxa2#
      • 1...Se2
        • 2.Qa2#
      • 1...Sb3
        • 2.Qc3#
      • 1...Sd3
        • 2.Qa2#

This anticipates 18557(1956)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE,P_SPINB(b)::QAR1(A),XB(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);P_SPINS(c)::QAB1(A)
      • Refutation
        • S(c);P_SPINB(b)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • B(b);N_GUARD,P_SPINS(c)::QAR1(A),XB(b)
      • B(b);N_GUARD,P_SPINS(c)::QAR1(A)
      • S(c);N_GUARD,P_SPINB(b)::QAR1(A),XS(c)
      • S(c);N_GUARD,P_SPINB(b)::QAR1(A)
      • S(c);P_SPINB(b)::QAB(A)
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