MESON Chess Problem Database

Problem Display
PID: 72756 (8/3R4/2p5/3bQ1B1/B7/P3q2r/R1Pk2NN/1K6 w - - 0 1)

Larsen, Karl Adolf Koefoed

L'Italia Scacchistica, 1931

8/3R4/2p5/3bQ1B1/B7/P3q2r/R1Pk2NN/1K6

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kd1
      • 2.c3#
    • 1...Qf4
      • 2.Qe1#
    • 1...Qxg5
      • 2.Qe1#
  • Tries
    • 1.Sf1+?
      • 1...Kd1
        • 2.c3#
      • 1...Ke2!
    • 1.Rxd5+?
      • 1...Ke2
        • 2.c3#
        • 2.c4#
      • 1...cxd5!
    • 1.Qxe3+?
      • 1...Kd1
        • 2.Qd2#
        • 2.Qe1#
        • 2.c3#
        • 2.c4#
      • 1...Rxe3!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qd3#
      • 1...Kd1
        • 2.c3#
      • 1...Ke2
        • 2.c4#
      • 1...Kc3
        • 2.Qb4#
      • 1...Qxg5
        • 2.Qe1#
      • 1...Qf4
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINQ(b),P-FLIGHT::B(G)+P(C)
    • Q(b);OGATE::QAB1(H)
    • Q(b);N_SPINQ(b),OGATE,XB(I)::QAB1(H)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(a);N_SPINQ(b),P-FLIGHT::B(G)+P(C)
      • Refutation
        • K(a);N_SPINB(d),P-FLIGHT
    • Try
      • R(J);CHECK,XB(d)
      • Refutation
        • P(e);XR(J)
    • Try
      • Q(H);CHECK,XQ(b)
      • Refutation
        • R(c);P_SPINR(c),XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAR1(H)
    • Vars
      • K(a);N_SPINQ(b),P-FLIGHT::B(G)+P(C)
      • K(a);N_SPINB(d),P-FLIGHT::R(B)+P(C)
      • K(a);N_SPINB(d),N_SPINQ(b),S_FLIGHT::QAB1(H)
      • Q(b);N_SPINQ(b),OGATE,XB(I)::QAB1(H)
      • Q(b);OGATE::QAB1(H)
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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).