MESON Chess Problem Database

Problem Display
PID: 99712 (2QR4/b3Kp1p/1p4br/4k1Np/5r2/3p4/3pq1pB/5N2 w - - 0 1)

Lukyanov, Valentin Volodimirovich

Nagnibida, Mykola Ivanovich

Magyar Sakkelet, 1975

2QR4/b3Kp1p/1p4br/4k1Np/5r2/3p4/3pq1pB/5N2

#2

6 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Sxf7#
    • 1...Bf5
      • 2.Qc3#
    • 1...f5
      • 2.Qe6#
      • 2.Qc3#
      • 2.Qc7#
    • 1...f6
      • 2.Qe6#
  • Tries
    • 1.Se3?
      • threat
        • 2.Sc4#
        • 2.Rd5#
        • 2.Qc3#
        • 2.Qc7#
      • 1...d1S
        • 2.Sc4#
        • 2.Rd5#
        • 2.Qc7#
      • 1...Qf3
        • 2.Sc4#
        • 2.Qc3#
        • 2.Qc7#
      • 1...Be4
        • 2.Sc4#
        • 2.Sxf7#
        • 2.Qc3#
      • 1...Bf5
        • 2.Sc4#
        • 2.Rd5#
        • 2.Qxf5#
        • 2.Qc3#
      • 1...Bb8
        • 2.Sc4#
        • 2.Rd5#
        • 2.Qc3#
        • 2.Qxb8#
      • 1...b5
        • 2.Rd5#
        • 2.Qc7#
      • 1...Qxe3!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qc7#
      • 1...Rc4
        • 2.S3e4#
      • 1...Rd4
        • 2.S3e4#
      • 1...Rf6
        • 2.Sf5#
      • 1...Be4
        • 2.Qc3#
      • 1...Bf5
        • 2.Sxf7#
      • 1...Bb8
        • 2.Qxb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(i);N_GUARD,SBLOCK::S(C),XP(l)
    • B(i);SBLOCK::QAB(E)
    • P(l);N_GUARD::QAR1(E)
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(4)
      • Refutation
        • Q(b);XS(A)
  • Actual
    • S(A);N_PINR(e)
    • Threat
      • QAB(E)
    • Vars
      • R(e);::B(B)+S(A)
      • B(i);S_CUTR(e)::QAB(E)
      • B(i);N_GUARD,S_CUTR(e)::S(C),XP(l)
      • B(k);N_GUARD::QAB(E),XB(k)
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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).