MESON Chess Problem Database

Problem Display
PID: 187761 (2nq1Q2/p7/1p1PN3/4P1p1/2Ppk1Nn/5RpP/8/3K4 w - - 0 1)

Beckers, Franz

The Times, 1909

2nq1Q2/p7/1p1PN3/4P1p1/2Ppk1Nn/5RpP/8/3K4

#2

9 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7
      • 2.Sxg5#
    • 1...Qxd6
      • 2.Sxg5#
    • 1...Qd7
      • 2.Sxg5#
    • 1...Qe8
      • 2.Sxg5#
    • 1...Qxf8
      • 2.Sxg5#
    • 1...Sg2
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sg6
      • 2.Qf5#
    • 1...Se7
      • 2.Sxg5#
    • 1...d3
      • 2.Re3#
    • 1...b5
      • 2.Sc5#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Sxg5#
        • 2.Qb7#
      • 1...Kxf3
        • 2.Qb7#
      • 1...Qxd6
        • 2.Sxg5#
      • 1...Sxf3
        • 2.Qh7#
      • 1...Sxd6
        • 2.Sxg5#
      • 1...Sxe7
        • 2.Sxg5#
      • 1...Qc7
        • 2.Sxg5#
      • 1...Qd7
        • 2.Sxg5#
      • 1...Qe8
        • 2.Sxg5#
      • 1...Qg8
        • 2.Qb7#
      • 1...d3
        • 2.Qb7#
      • 1...Qxe7!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qc6#
      • 1...Kxf3
        • 2.Qc6#
      • 1...Qxd6
        • 2.Sxg5#
      • 1...Qxe8
        • 2.Sxg5#
      • 1...Sxf3
        • 2.Qg6#
      • 1...Qc7
        • 2.Sxg5#
      • 1...Qd7
        • 2.Sxg5#
      • 1...Se7
        • 2.Sxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD::S(H),XP(e)
    • Q(i);N_GUARD,XP(G)::S(H),XP(e)
    • Q(i);N_GUARD,XQ(I)::S(H),XP(e)
    • S(d);N_GUARD::QAB1(I)
    • S(d);N_GUARD::QAB1(I),XS(d)
    • S(h);S_CUTQ(i)::S(H),XP(e)
    • P(b);N_GUARD::R1(B)
    • P(f);N_GUARD::S(H)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);S_FLIGHT,XR(B)::QAB(I)
        • Q(i);XP(G)::S(H),XP(e)
        • S(d);N_GUARD,SBLOCK,XR(B)::QAB(I)
        • S(h);XP(G)::S(H),XP(e)
        • S(h);XQ(I)::S(H),XP(e)
        • Q(i);::S(H),XP(e)
        • Q(i);::QAB(I)
        • P(b);::QAB(I)
      • Refutation
        • Q(i);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB(I)
    • Vars
      • K(c);S_FLIGHT,XR(B)::QAB(I)
      • Q(i);N_GUARD,XP(G)::S(H),XP(e)
      • Q(i);N_GUARD,XQ(I)::S(H),XP(e)
      • S(d);N_GUARD,SBLOCK,XR(B)::QAB(I)
      • Q(i);N_GUARD::S(H),XP(e)
      • S(h);S_CUTQ(i)::S(H),XP(e)
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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).