MESON Chess Problem Database

Problem Display
PID: 242581 (5K2/p2N2p1/2p5/r4p2/1pPknQ1N/1P3p2/2BPp3/4rqb1 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Tidskrift for Schack, 1979

5K2/p2N2p1/2p5/r4p2/1pPknQ1N/1P3p2/2BPp3/4rqb1

#2

8 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sxf5#
      • 2.Qe5#
    • 1...Ra2
      • 2.Sxf5#
      • 2.Qe5#
    • 1...Ra3
      • 2.Sxf5#
      • 2.Qe5#
    • 1...Ra4
      • 2.Sxf5#
      • 2.Qe5#
    • 1...Re5
      • 2.Qxe5#
    • 1...Ra6
      • 2.Sxf5#
      • 2.Qe5#
    • 1...Bf2
      • 2.Sxf3#
    • 1...Bh2
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...f2
      • 2.Sf3#
      • 2.Qe3#
    • 1...c5
      • 2.Sxf5#
      • 2.Qe5#
  • Tries
    • 1.Qd6+?
      • 1...Rd5
        • 2.Sxf5#
      • 1...Sxd6!
    • 1.Qxf3?
      • threat
        • 2.Qd3#
      • 1...Qxf3
        • 2.Sxf3#
      • 1...Be3
        • 2.Qxe3#
      • 1...Sf2
        • 2.Qe3#
      • 1...Sc5
        • 2.Sxf5#
      • 1...Qh3!
  • Keys
    • 1.Qxf5!
      • threat
        • 2.Qxe4#
      • 1...Rxf5+
        • 2.Sxf5#
      • 1...Sxd2
        • 2.Qd3#
      • 1...Re5
        • 2.Qxe5#
      • 1...Sf2
        • 2.Sxf3#
      • 1...Sc3
        • 2.Qd3#
      • 1...Sg3
        • 2.Qd3#
      • 1...Sc5
        • 2.Qe5#
      • 1...Sg5
        • 2.Qd3#
      • 1...Sd6
        • 2.Qd3#
      • 1...Sf6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 3
  • Sets
    • R(i);N_GUARD::QAB1(E),XR(i)
    • B(c);S_CUTQ(b)::S(F),XP(e)
    • B(c);N_GUARD::QAB1(E)
    • B(c);N_GUARD::QAB1(E),XB(c)
  • Tries
    • Try
      • Q(E);CHECK,N_PINS(h)
      • Vars
        • R(i);P_SPINR(i)::S(F),XP(j)
      • Refutation
        • S(h);XQ(E)
    • Try
      • Q(E);N_PINS(h),XP(e)
      • Threat
        • QAR1(E)
      • Vars
        • Q(b);XQ(E)::S(F),XQ(b)
        • B(c);N_GUARD::QAB1(E),XB(c)
        • S(h);S_CUTB(c)::QAB1(E)
        • S(h);S_CUTR(i)::S(F),XP(j)
      • Refutation
        • Q(b);
  • Actual
    • Q(E);N_PINS(h),XP(j)
    • Threat
      • QAR1(E),XS(h)
    • Vars
      • R(i);CHECK,XQ(E)::S(F),XR(i)
      • S(h);OGATE,XP(B)::QAR1(E)
      • R(i);N_GUARD::QAB1(E),XR(i)
      • S(h);S_CUTQ(b)::S(F),XP(e)
      • S(h);OGATE::QAR1(E)
      • S(h);S_CUTR(i)::QAB1(E)
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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).