MESON Chess Problem Database

Problem Display
PID: 223251 (4K3/1nQ5/R2q3p/4k2P/4p2P/2p1N1p1/3R2B1/B7 w - - 0 1)

Jespersen, Karl Lorenz Jesper

English Mechanic and World of Science, 1885

(First published on Fri May 1 1885)

4K3/1nQ5/R2q3p/4k2P/4p2P/2p1N1p1/3R2B1/B7

#2

9 + 7

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qe7#
    • 1...Kf6
      • 2.Qe7#
    • 1...Sa5
      • 2.Qxd6#
    • 1...Sc5
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qxd6#
  • Tries
    • 1.Bxc3+?
      • 1...Ke6
        • 2.Bh3#
        • 2.Qc4#
        • 2.Qd7#
        • 2.Qe7#
        • 2.Qf7#
        • 2.Qc8#
      • 1...Kf4!
    • 1.Rd5+?
      • 1...Ke6
        • 2.Qe7#
        • 2.Qf7#
      • 1...Kf6
        • 2.Qe7#
        • 2.Qf7#
      • 1...Kf4!
    • 1.Rdxd6?
      • threat
        • 2.Rd5#
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Kf4!
    • 1.Ra5+?
      • 1...Ke6
        • 2.Qf7#
      • 1...Kf6
        • 2.Qf7#
      • 1...Sxa5
        • 2.Qxd6#
      • 1...Sc5
        • 2.Qxd6#
      • 1...Kf4!
    • 1.Raxd6?
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Sa5
        • 2.Ra6#
        • 2.Rb6#
        • 2.Rc6#
        • 2.Rg6#
        • 2.Rxh6#
      • 1...Sc5
        • 2.Ra6#
        • 2.Rb6#
        • 2.Rc6#
        • 2.Rg6#
        • 2.Rxh6#
      • 1...Sd8
        • 2.Ra6#
        • 2.Rb6#
        • 2.Rc6#
        • 2.Rg6#
        • 2.Rxh6#
      • 1...Kf4!
    • 1.Qg7+?
      • 1...Ke6
        • 2.Bh3#
        • 2.Qe7#
      • 1...Qf6
        • 2.Qxf6#
      • 1...Kf4!
  • Keys
    • 1.Rd4!
      • 1...Kxd4
        • 2.Qxc3#
      • 1...Kf4
        • 2.Rxe4#
      • 1...Ke6
        • 2.Qe7#
      • 1...Kf6
        • 2.Qe7#
      • 1...Qxc7
        • 2.Rxe4#
      • 1...Sa5
        • 2.Qxd6#
      • 1...Sc5
        • 2.Qxd6#
      • 1...Sd8
        • 2.Qxd6#
      • 1...c2
        • 2.Rxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINP(a),P-FLIGHT::QAR1(H)
    • K(d);S_FLIGHT::QAB1(H)
    • S(g);N_GUARD::QAB1(H),XQ(e)
  • Tries
    • Try
      • B(A);CHECK,XP(a)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(B);CHECK
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
    • Try
      • R(B);XQ(e)
      • Threat
        • QAB(H)+R(B),DCHECK
      • Vars
        • S(g);CHECK,OGATE,P_SPINS(g),XR(B)::QAB1(H),XS(g)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
    • Try
      • R(G);CHECK
      • Vars
        • K(d);N_SPINP(a),N_SPINQ(e),P-FLIGHT::QAB1(H)
        • K(d);N_SPINQ(e),S_FLIGHT::QAR1(H)
        • S(g);XR(G)::QAB1(H),XQ(e)
        • S(g);P_SPINS(g)::QAB1(H),XQ(e)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
    • Try
      • R(G);XQ(e)
      • Vars
        • S(g);CHECK,OGATE,P_SPINS(g),XR(G)::QAB1(H),XS(g)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
    • Try
      • Q(H);CHECK,N_PINQ(e)
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e)::QAB1(H),XQ(e)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
  • Actual
    • R(B);N_PINP(a)
    • Vars
      • K(d);N_SPINQ(e),OGATEB,P_SPINP(a),S_FLIGHT,XR(B)::QAB1(H),XP(a)
      • K(d);P_SPINP(c),S_FLIGHT::R1(B),XP(c)
      • K(d);P-FLIGHT::QAR1(H)
      • K(d);S_FLIGHT::QAB1(H)
      • Q(e);N_SPINQ(e),XQ(H)::R1(B),XP(c)
      • S(g);N_GUARD::QAB1(H),XQ(e)
      • P(a);::B(A)+R(B),DCHECK,XP(c)
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