MESON Chess Problem Database

Problem Display
PID: 225590 (4N1K1/4p3/2pN4/p2k2n1/2pP2Q1/q3p2p/8/8 w - - 0 1)

Lech, Anton

Praca, 1954

4N1K1/4p3/2pN4/p2k2n1/2pP2Q1/q3p2p/8/8

#2

5 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Se6
      • 2.Qe4#
    • 1...Sf7
      • 2.Qe4#
    • 1...Sh7
      • 2.Qe4#
    • 1...exd6
      • 2.Sf6#
      • 2.Sc7#
  • Tries
    • 1.Sc8?
      • threat
        • 2.Sb6#
        • 2.Sc7#
      • 1...c3
        • 2.Sb6#
      • 1...c5
        • 2.Sxe7#
      • 1...Qb2
        • 2.Sxe7#
        • 2.Sc7#
      • 1...Qb4
        • 2.Sc7#
      • 1...Qc5
        • 2.Sc7#
      • 1...Qd6
        • 2.Sb6#
      • 1...Qb3
        • 2.Sxe7#
        • 2.Sc7#
      • 1...Se6
        • 2.Sb6#
      • 1...Se4!
    • 1.Sf6+?
      • 1...Kxd6
        • 2.Qd7#
      • 1...exf6!
    • 1.Qf5+?
      • 1...e5
        • 2.Qxe5#
      • 1...Kxd4!
    • 1.Qxg5+?
      • 1...Ke6
        • 2.Qf5#
      • 1...e5
        • 2.Qxe5#
      • 1...Kxd4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sc7#
      • 1...Ke6
        • 2.Sxe3#
      • 1...c3
        • 2.Sxe3#
      • 1...c5
        • 2.Sxe7#
      • 1...Qd6
        • 2.Sxe3#
      • 1...Se6
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(g);N_GUARD::QAB1(B)
    • S(g);N_GUARD::QAB1(B),XS(g)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::S(C)
        • P(h);S_CUTQ(a)::S(C),XP(i)
        • Q(a);::S(D)
        • Q(a);::S(C)
        • S(g);::S(C)
      • Refutation
        • S(g);
    • Try
      • S(D);CHECK
      • Vars
        • K(f);P-FLIGHT,XS(C)::QAR1(B)
      • Refutation
        • P(i);XS(D)
    • Try
      • Q(B);CHECK
      • Vars
        • P(i);P_SPINP(i)::QAR1(B),XP(i)
      • Refutation
        • K(f);P-FLIGHT,XP(A)
    • Try
      • Q(B);CHECK,XS(g)
      • Vars
        • K(f);S_FLIGHT::QAB1(B)
        • P(i);P_SPINP(i)::QAR1(B),XP(i)
      • Refutation
        • K(f);P-FLIGHT,XP(A)
  • Actual
    • S(C);
    • Threat
      • S(D)
    • Vars
      • K(f);S_FLIGHT::QAB(B)+S(C),XP(b)
      • P(d);S_CUTQ(a)::S(C),XP(b)
      • P(h);S_CUTQ(a)::S(C),XP(i)
      • Q(a);N_GUARD::S(C),XP(b)
      • S(g);N_GUARD,SBLOCK::QAB(B)
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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).