MESON Chess Problem Database

Problem Display
PID: 234143 (Q4K2/5p2/2p1pR2/2N1kqpP/2P1b1B1/BP6/7P/4R3 w - - 0 1)

Lagerstrom, Georg

Tidskrift for Schack, 1915

Q4K2/5p2/2p1pR2/2N1kqpP/2P1b1B1/BP6/7P/4R3

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Rxe4#
    • 1...Kd6
      • 2.Qb8#
    • 1...Kxf6
      • 2.Sd7#
  • Tries
    • 1.Sd3+?
      • 1...Kxf6
        • 2.Be7#
        • 2.Qd8#
      • 1...Kd4!
    • 1.Bb2+?
      • 1...Kf4
        • 2.Rxe4#
      • 1...Kd6!
    • 1.Rxe4+?
      • 1...Kd6
        • 2.Qb8#
        • 2.Qd8#
      • 1...Kxf6
        • 2.Sd7#
        • 2.Qd8#
      • 1...Qxe4!
    • 1.Rxf5+?
      • 1...Kd4
        • 2.Bb2#
      • 1...Kd6
        • 2.Qb8#
        • 2.Qd8#
      • 1...exf5!
    • 1.Qb8+?
      • 1...Kxf6
        • 2.Sd7#
      • 1...Kd4!
    • 1.Qd8?
      • threat
        • 2.Sd3#
      • 1...Kf4
        • 2.Rxe4#
      • 1...Qf1
        • 2.Bb2#
        • 2.Rxe4#
      • 1...Qf3!
  • Keys
    • 1.Qa7!
      • 1...Kd4
        • 2.Bb2#
      • 1...Kf4
        • 2.Rxe4#
      • 1...Kd6
        • 2.Qb8#
      • 1...Kxf6
        • 2.Sd7#
      • 1...Qxg4
        • 2.Sd7#
      • 1...Qxf6
        • 2.Sd3#
      • 1...Qg6
        • 2.Sd7#
      • 1...Qh7
        • 2.Sd7#
      • 1...Qf1
        • 2.Sd7#
      • 1...Qf2
        • 2.Sd7#
      • 1...Qf3
        • 2.Sd7#
      • 1...Qf4
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINB(a),P_SPINQ(c),S_FLIGHT::R1(A),XB(a)
    • K(b);N_SPINB(a),P_SPINP(f),S_FLIGHT::QAB(J)
    • K(b);N_SPINB(a),S_FLIGHT,XR(I)::S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • B(C);CHECK
      • Vars
        • K(b);N_SPINB(a),P_SPINQ(c),S_FLIGHT::R1(A),XB(a)
      • Refutation
        • K(b);N_SPINB(a),P_SPINP(f),S_FLIGHT
    • Try
      • R(A);CHECK,XB(a)
      • Refutation
        • Q(c);XR(A)
    • Try
      • R(I);CHECK,XQ(c)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::B(C)
      • Refutation
        • P(f);XR(I)
    • Try
      • Q(J);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XR(I)::S(G)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(J);
      • Threat
        • S(G)
      • Vars
        • K(b);N_SPINB(a),P_SPINQ(c),S_FLIGHT::R1(A),XB(a)
      • Refutation
        • Q(c);
  • Actual
    • Q(J);
    • Vars
      • K(b);N_SPINB(a),S_FLIGHT::B(C)
      • K(b);N_SPINB(a),P_SPINQ(c),S_FLIGHT::R1(A),XB(a)
      • K(b);N_SPINB(a),P_SPINP(f),S_FLIGHT::QAB(J)
      • K(b);N_SPINB(a),S_FLIGHT,XR(I)::S(G)
      • Q(c);XB(F)::S(G)
      • Q(c);SBLOCK,XR(I)::S(G)
      • Q(c);::S(G)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).