MESON Chess Problem Database

Problem Display
PID: 196830 (8/K3Bpr1/2Qnk1p1/3N4/8/1B1N4/8/8 w - - 0 1)

Lindgren, Frithiof

1st Prize, Dagens Nyheder, 1919

8/K3Bpr1/2Qnk1p1/3N4/8/1B1N4/8/8

#2

6 + 5

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Se3#
  • Tries
    • 1.Sc3+?
      • 1...Kf5
        • 2.Qf3#
        • 2.Qd7#
      • 1...Kxe7!
    • 1.S5b4+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Kxe7!
    • 1.Sb6+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Kxe7!
    • 1.Sf6+?
      • 1...Kf5
        • 2.Qd5#
        • 2.Qc5#
      • 1...Kxe7!
    • 1.Sc7+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Kxe7!
  • Keys
    • 1.Bd8!
      • threat
        • 2.Se3#
      • 1...f5+
        • 2.Sc7#
      • 1...f6+
        • 2.Se7#
      • 1...Kf5
        • 2.Se3#

This anticipates 18136(1953)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINS(a),S_FLIGHT::S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XB(F)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(D)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XB(F)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(D)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XB(F)
    • Try
      • S(C);CHECK
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XB(F)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(D)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XB(F)
  • Actual
    • B(F);
    • Threat
      • B(A)+S(C)
    • Vars
      • P(d);CHECK,SBLOCK::B(A)+S(C),DCHECK
      • P(d);CHECK,SBLOCK::B(A)+S(C)
      • K(b);N_SPINS(a),S_FLIGHT::S(C)
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