MESON Chess Problem Database

Problem Display
PID: 250230 (5n1q/4p1bp/8/5kNB/K2B2N1/1p2Q1P1/8/1b2nrr1 w - - 0 1)

Palkoska, Emil

Jas, 1927

5n1q/4p1bp/8/5kNB/K2B2N1/1p2Q1P1/8/1b2nrr1

#2

7 + 11

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Qxf4#
    • 1...Bf6
      • 2.Sh6#
    • 1...Bh6
      • 2.Sxh6#
    • 1...Sf3
      • 2.Qf4#
  • Tries
    • 1.Bxg7?
      • threat
        • 2.Sh6#
        • 2.Qe5#
      • 1...Rf4+
        • 2.Qxf4#
      • 1...Be4
        • 2.Sh6#
      • 1...Sd3
        • 2.Sh6#
      • 1...Sf3
        • 2.Sh6#
        • 2.Qf4#
      • 1...Sg6
        • 2.Sh6#
      • 1...Sd7
        • 2.Sh6#
      • 1...e5
        • 2.Sh6#
        • 2.Qxe5#
      • 1...h6
        • 2.Qe5#
      • 1...Qxg7!
  • Keys
    • 1.Bf6!
      • threat
        • 2.Qe5#
      • 1...Rf4+
        • 2.Qxf4#
      • 1...Bxf6
        • 2.Sh6#
      • 1...exf6
        • 2.Qc5#
      • 1...Be4
        • 2.Qxe4#
      • 1...Sd3
        • 2.Qe4#
      • 1...Sf3
        • 2.Qf4#
      • 1...Sg6
        • 2.Qe6#
      • 1...Sd7
        • 2.Qe6#
      • 1...e5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD,P_PINB(D)::QAR1(A),XR(c)
    • B(h);N_GUARD::S(E)
    • B(h);N_GUARD::S(E),XB(h)
    • S(b);S_CUTR(c)::QAR1(A)
  • Tries
    • Try
      • B(D);XB(h)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);CHECK,N_GUARD::QAR1(A),XR(c)
        • B(a);::S(E)
        • S(b);::S(E)
        • S(j);::S(E)
        • P(i);::QAR1(A)
      • Refutation
        • Q(k);XB(D)
  • Actual
    • B(D);
    • Threat
      • QAR1(A)
    • Vars
      • R(c);CHECK,N_GUARD::QAR1(A),XR(c)
      • B(h);N_GUARD,SBLOCK,XB(D)::S(E)
      • P(g);N_GUARD,XB(D)::QAR(A)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • S(b);S_CUTB(a)::QAB1(A)
      • S(b);S_CUTR(c)::QAR1(A)
      • S(j);N_GUARD::QAB1(A)
      • P(g);::QAR1(A),XP(g)
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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).