MESON Chess Problem Database

Problem Display
PID: 75551 (1bK5/1p2Prp1/2N3R1/2p5/2r1Pk1P/B4pqp/1Q2R2N/1n5B w - - 0 1)

Lennon, Jean

di Scala, Pascal

Themes-64, 1962

1bK5/1p2Prp1/2N3R1/2p5/2r1Pk1P/B4pqp/1Q2R2N/1n5B

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Rg4#
    • 1...Qf2
      • 2.Rg4#
    • 1...Qg4+
      • 2.Rxg4#
    • 1...Rf8+
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Be5
      • 2.Qxe5#
    • 1...Ba7
      • 2.Qe5#
    • 1...Sd2
      • 2.Qxd2#
    • 1...Sxa3
      • 2.Qd2#
    • 1...Sc3
      • 2.Qc1#
      • 2.Qd2#
    • 1...bxc6
      • 2.Qxb8#
  • Tries
    • 1.Qc1+?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Rxc1!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qe3#
      • 1...Qg4+
        • 2.Rxg4#
      • 1...Rf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qxg6
        • 2.Qxf3#
      • 1...Rxe4
        • 2.Qxf7#
      • 1...fxe2
        • 2.Qxg3#
      • 1...bxc6
        • 2.Qxb8#
      • 1...Qg5
        • 2.Qxf3#
      • 1...Qf2
        • 2.Rg4#
      • 1...Qg1
        • 2.Qxf3#
      • 1...Rc3
        • 2.Qxf7#
      • 1...Sc3
        • 2.Bc1#
      • 1...f2
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_GUARD::R1(I)
    • Q(c);CHECK,N_GUARD::R1(I),XQ(c)
    • R(i);CHECK,OGATE::PXR(i)=Q
    • B(k);N_GUARD::QAB1(B),XB(k)
    • B(k);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB(B),XS(a)
    • S(a);N_GUARD,XB(E)::QAB(B)
    • P(h);OGATE,XS(H)::QAB(B),XB(k)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(B),XS(a)
      • Refutation
        • R(e);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);CHECK,N_GUARD::R1(I),XQ(c)
      • R(i);CHECK,OGATE::PXR(i)=Q
      • Q(c);N_GUARD,XR(I)::QAR1(B),XP(b)
      • R(e);OGATE,XP(F)::QAR(B),XR(i)
      • P(b);OGATE,XR(C)::QAB1(B),XQ(c)
      • P(h);OGATE,XS(H)::QAB(B),XB(k)
      • Q(c);N_GUARD::QAR1(B),XP(b)
      • Q(c);N_GUARD::R1(I)
      • R(e);OGATE::QAR(B),XR(i)
      • S(a);N_GUARD,S_CUTR(e)::B(E)
      • P(b);OGATE::QAB1(B),XQ(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).