MESON Chess Problem Database

Problem Display
PID: 271437 (1q2Q2B/1p1n4/3r2p1/3PpkN1/5N1K/1pp1P1p1/2r4b/1B6 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Probleemblad, 1951

1q2Q2B/1p1n4/3r2p1/3PpkN1/5N1K/1pp1P1p1/2r4b/1B6

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qxg6#
      • 2.Qe6#
    • 1...Re6
      • 2.Qxe6#
    • 1...Sc5
      • 2.Qxe5#
    • 1...Sb6
      • 2.Qxe5#
    • 1...Sf6
      • 2.Qxg6#
    • 1...Sf8
      • 2.Qxe5#
    • 1...exf4
      • 2.Qe4#
      • 2.e4#
    • 1...e4
      • 2.Qxe4#
  • Tries
    • 1.Se2?
      • threat
        • 2.e4#
      • 1...Sc5
        • 2.Qxe5#
      • 1...e4
        • 2.Sd4#
        • 2.Qxe4#
      • 1...Sf6!
    • 1.Sg2?
      • threat
        • 2.e4#
      • 1...Sc5
        • 2.Qxe5#
      • 1...e4
        • 2.Qxe4#
      • 1...Sf6!
    • 1.Sd3?
      • threat
        • 2.e4#
      • 1...Sf6
        • 2.Qxe5#
      • 1...Sc5
        • 2.Qxe5#
      • 1...e4
        • 2.Qxe4#
      • 1...Re2!
    • 1.Sfh3?
      • threat
        • 2.e4#
      • 1...Sc5
        • 2.Qxe5#
      • 1...e4
        • 2.Qxe4#
      • 1...Sf6!
    • 1.Sh5?
      • threat
        • 2.e4#
      • 1...Sf6
        • 2.Sg7#
      • 1...Sc5
        • 2.Qxe5#
      • 1...e4
        • 2.Qxe4#
      • 1...gxh5!
    • 1.Bxc2+?
      • 1...e4
        • 2.Bxe4#
        • 2.Qxe4#
      • 1...bxc2!
    • 1.Qxd7+?
      • 1...Re6
        • 2.Qxe6#
      • 1...Rxd7!
    • 1.Qf7+?
      • 1...Sf6
        • 2.Qxg6#
      • 1...Rf6!
  • Keys
    • 1.Sfe6!
      • threat
        • 2.e4#
      • 1...Rxe6
        • 2.Qxe6#
      • 1...Sf6
        • 2.Sg7#
      • 1...Sc5
        • 2.Qf7#
      • 1...e4
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(h);N_GUARD::QAB1(G),XR(h)
    • S(k);N_GUARD::QAR1(G),XP(f)
    • S(k);S_CUTR(h)::QAB1(G),XP(i)
    • P(f);N_SPINR(a),OGATE::QAB1(G),XP(f)
  • Tries
    • Try
      • S(C);
      • Threat
        • P(B)
      • Vars
        • S(k);N_GUARD::QAR1(G),XP(f)
      • Refutation
        • S(k);
    • Try
      • S(C);
      • Threat
        • P(B)
      • Vars
        • S(k);N_GUARD::QAR1(G),XP(f)
        • P(f);N_SPINR(a),OGATE::QAB1(G),XP(f)
      • Refutation
        • S(k);
    • Try
      • S(C);N_PINR(a)
      • Threat
        • P(B)
      • Vars
        • S(k);N_GUARD::QAR1(G),XP(f)
        • P(f);OGATE::QAB1(G),XP(f)
      • Refutation
        • R(a);
    • Try
      • S(C);
      • Threat
        • P(B)
      • Vars
        • S(k);N_GUARD::QAR1(G),XP(f)
        • P(f);N_SPINR(a),OGATE::QAB1(G),XP(f)
      • Refutation
        • S(k);
    • Try
      • S(C);
      • Threat
        • P(B)
      • Vars
        • S(k);SBLOCK::S(C)
        • S(k);N_GUARD::QAR1(G),XP(f)
        • P(f);N_SPINR(a),OGATE::QAB1(G),XP(f)
      • Refutation
        • P(i);XS(C)
    • Try
      • B(A);CHECK,XR(a)
      • Refutation
        • P(c);XB(A)
    • Try
      • Q(G);CHECK,XS(k)
      • Vars
        • R(h);N_GUARD::QAB1(G),XR(h)
      • Refutation
        • R(h);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • S(k);P_SPINS(k),S_CUTR(h)::QAB1(G),XP(i)
      • Refutation
        • R(h);
  • Actual
    • S(C);
    • Threat
      • P(B)
    • Vars
      • R(h);OGATE,XS(C)::QAB1(G),XR(h)
      • S(k);SBLOCK::S(C)
      • S(k);N_GUARD::QAR2(G)
      • P(f);N_GUARD,N_SPINR(a)::S(C)
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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).