MESON Chess Problem Database

Problem Display
PID: 90949 (Bb1r4/pR6/r7/4nb2/1pPPkNp1/q4p2/3Q1P2/4n1K1 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Die Schwalbe, 1968

Bb1r4/pR6/r7/4nb2/1pPPkNp1/q4p2/3Q1P2/4n1K1

#2

8 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qe3#
    • 1...Qa1
      • 2.Qe3#
    • 1...Qa2
      • 2.Qe3#
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qa4
      • 2.Qe3#
    • 1...Qa5
      • 2.Qe3#
    • 1...S1d3
      • 2.Qe3#
    • 1...S5d3
      • 2.Qe3#
    • 1...Sxc4
      • 2.Re7#
    • 1...Sg6
      • 2.Re7#
    • 1...Sd7
      • 2.Rb6#
    • 1...Sf7
      • 2.Re7#
    • 1...b3
      • 2.Qe3#
  • Tries
    • 1.Rb6+?
      • 1...Rd5
        • 2.Bxd5#
      • 1...Sc6!
    • 1.Re7+?
      • 1...Rd5
        • 2.Bxd5#
      • 1...Rc6!
  • Keys
    • 1.Sh5!
      • threat
        • 2.Sg3#
      • 1...Sxc4
        • 2.Re7#
      • 1...Qd3
        • 2.Qf4#
      • 1...S1d3
        • 2.Qe3#
      • 1...S5d3
        • 2.Qe3#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Sc6
        • 2.Sf6#
      • 1...Sg6
        • 2.Re7#
      • 1...Sd7
        • 2.Rb6#
      • 1...Sf7
        • 2.Re7#
      • 1...g3
        • 2.Sxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(b);N_GUARD::QAR1(B)
    • Q(b);N_GUARD,P_PINP(C)::QAR1(B),XQ(b)
    • S(a);S_CUTQ(b)::QAR1(B)
    • S(g);S_CUTQ(b)::QAR1(B)
    • S(g);XP(D)::B(H)+R(G),DCHECK
    • S(g);::B(H)+R(G),DCHECK
    • S(g);N_GUARD,S_CUTR(l)::B(H)+R(G)
    • P(d);S_CUTQ(b)::QAR1(B)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • R(l);N_GUARD,P_SPINR(l)::B(H),XR(l)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • R(G);CHECK,P_PINS(g)
      • Vars
        • R(l);N_GUARD,P_SPINR(l)::B(H),XR(l)
      • Refutation
        • R(i);P_SPINR(i)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • S(g);XP(D)::B(H)+R(G),DCHECK
      • Q(b);SBLOCK::QAR1(B)
      • S(a);S_CUTQ(b)::QAR1(B)
      • S(g);S_CUTQ(b)::QAR1(B)
      • Q(b);N_GUARD,P_PINP(C)::QAR1(B),XQ(b)
      • S(g);S_CUTR(i)::S(F)
      • S(g);::B(H)+R(G),DCHECK
      • S(g);N_GUARD,S_CUTR(l)::B(H)+R(G)
      • P(f);::S(F),XP(f)
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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).