MESON Chess Problem Database

Problem Display
PID: 186213 (4r2b/1p1Q4/1q1Pn3/Rn4p1/RB1PkPK1/4p3/2N1P3/1B6 w - - 0 1)

Gockel, Hubert

Suomen Shakki, 1981

4r2b/1p1Q4/1q1Pn3/Rn4p1/RB1PkPK1/4p3/2N1P3/1B6

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa5
      • 2.Qxb7#
    • 1...Qd8
      • 2.Qxb7#
    • 1...Sa3
      • 2.Qh7#
    • 1...Sc3
      • 2.Qh7#
    • 1...Sa7
      • 2.Qh7#
    • 1...Sbc7
      • 2.Qh7#
    • 1...Sxf4
      • 2.Qf5#
    • 1...Sc5
      • 2.Qf5#
    • 1...Sec7
      • 2.Qf5#
    • 1...Sd8
      • 2.Qf5#
    • 1...Sf8
      • 2.Qf5#
  • Tries
    • 1.Qxb7+?
      • 1...Qc6
        • 2.Qxc6#
      • 1...Qxb7!
  • Keys
    • 1.Bc3!
      • threat
        • 2.Sb4#
      • 1...Kd5
        • 2.Sxe3#
      • 1...Qxd4
        • 2.Qxb7#
      • 1...Sxc3
        • 2.Qh7#
      • 1...Sbxd4
        • 2.Qh7#
      • 1...Sexd4
        • 2.Qf5#
      • 1...Sxf4
        • 2.Qf5#
      • 1...Sa3
        • 2.Qh7#
      • 1...Sc5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(e);N_GUARD,XR(I)::QAB(K),XP(g)
    • Q(e);N_GUARD::QAB(K),XP(g)
    • S(c);::QAB(K)
    • S(f);OGATE,XP(G)::QAB1(K)
    • S(f);OGATE::QAB1(K)
  • Tries
    • Try
      • Q(K);CHECK,XP(g)
      • Vars
        • Q(e);N_GUARD,P_SPINQ(e)::QAB(K),XQ(e)
      • Refutation
        • Q(e);XQ(K)
  • Actual
    • B(E);
    • Threat
      • B(A)+S(B)
    • Vars
      • K(b);P_SPINS(c),S_FLIGHT::S(B),XP(a)
      • Q(e);N_GUARD,P_SPINQ(e),XP(F)::QAB(K),XP(g)
      • S(c);XB(E)::QAB(K)
      • S(c);P_SPINS(c),XP(F)::QAB(K)
      • S(f);OGATE,P_SPINS(f),XP(F)::QAB1(K)
      • S(f);OGATE,XP(G)::QAB1(K)
      • S(c);::QAB(K)
      • S(f);OGATE::QAB1(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).