MESON Chess Problem Database

Problem Display
PID: 262374 (5Nkb/6n1/5P1B/7B/p7/p4P2/P7/K6Q w - - 0 1)

Petkov, Petko Andonov

Europe Echecs, 1960

5Nkb/6n1/5P1B/7B/p7/p4P2/P7/K6Q

#2

8 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Qb1?
      • 1...Kxf8
        • 2.Qb8#
      • 1...Sxh5
        • 2.Qh7#
      • 1...Se6
        • 2.Qh7#
      • 1...Se8
        • 2.Qh7#
      • 1...Sf5!
    • 1.Qc1?
      • 1...Kxf8
        • 2.Qc8#
      • 1...Sxh5
        • 2.Qc4#
      • 1...Sf5
        • 2.Qc4#
      • 1...Se8
        • 2.Qc4#
      • 1...Se6!
    • 1.Qd1?
      • 1...Kxf8
        • 2.Qd8#
      • 1...Sxh5
        • 2.Qd5#
      • 1...Sf5
        • 2.Qd5#
      • 1...Se8
        • 2.Qd5#
      • 1...Se6!
    • 1.Qh3?
      • 1...Kxf8
        • 2.Qc8#
      • 1...Sxh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...Sf5!
    • 1.f4?
      • 1...Kxf8
        • 2.Qa8#
      • 1...Sxh5
        • 2.Qd5#
      • 1...Sf5
        • 2.Qd5#
      • 1...Se8
        • 2.Qd5#
      • 1...Se6!
  • Keys
    • 1.Qe1!
      • 1...Kxf8
        • 2.Qe8#
      • 1...Sxh5
        • 2.Qe6#
      • 1...Sf5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR(B)
        • S(c);P_PINP(F),XB(E)::QAB1(B)
        • S(c);P_PINP(F)::QAB1(B)
      • Refutation
        • S(c);P_PINP(F)
    • Try
      • Q(B);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR(B)
        • S(c);N_GUARD,P_PINP(F),XB(E)::QAB(B)
        • S(c);N_GUARD,P_PINP(F)::QAB(B)
      • Refutation
        • S(c);P_PINP(F)
    • Try
      • Q(B);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR2(B)
        • S(c);N_GUARD,P_PINP(F),XB(E)::QAB(B)
        • S(c);N_GUARD,P_PINP(F)::QAB(B)
      • Refutation
        • S(c);P_PINP(F)
    • Try
      • Q(B);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR(B)
        • S(c);N_GUARD,P_PINP(F),XB(E)::QAB(B)
        • S(c);N_GUARD,P_PINP(F)::QAB(B),XS(c)
        • S(c);N_GUARD,P_PINP(F)::QAB(B)
      • Refutation
        • S(c);P_PINP(F)
    • Try
      • P(D);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR(B)
        • S(c);N_GUARD,P_PINP(F),XB(E)::QAB(B)
        • S(c);N_GUARD,P_PINP(F)::QAB(B)
      • Refutation
        • S(c);P_PINP(F)
  • Actual
    • Q(B);
    • Vars
      • K(d);OGATEB,P-FLIGHT,P_SPINS(c),XS(H)::QAR1(B)
      • S(c);N_GUARD,P_PINP(F),XB(E)::QAB(B)
      • S(c);N_GUARD,P_PINP(F)::QAB(B)
      • S(c);N_GUARD,P_PINP(F)::QAB(B),XS(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).