MESON Chess Problem Database

Problem Display
PID: 141007 (3N2B1/2p1K1p1/b1r1n1P1/Rn1Pk1p1/qp2p1Pp/1P4r1/5Q1B/4NR2 w - - 0 1)

Kozlov, Aleksandr Ivanovich

Shakhmaty v SSSR, 1950

3N2B1/2p1K1p1/b1r1n1P1/Rn1Pk1p1/qp2p1Pp/1P4r1/5Q1B/4NR2

#2

12 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sf7#
    • 1...Sc3
      • 2.Sf7#
    • 1...Sbd4
      • 2.Sf7#
    • 1...Sa7
      • 2.Sf7#
    • 1...Sf4
      • 2.Sxc6#
    • 1...Sc5
      • 2.Sxc6#
    • 1...Sf8
      • 2.Sxc6#
  • Tries
    • 1.Sxe6?
      • threat
        • 2.Qf5#
      • 1...Kxd5
        • 2.Qd4#
        • 2.Qf5#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sd6
        • 2.Qd4#
      • 1...Rxe6+!
    • 1.Qf6+?
      • 1...Kxd5
        • 2.Rf5#
      • 1...gxf6!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Rf5#
      • 1...Kxd5
        • 2.Rf5#
      • 1...Sd6
        • 2.Sf3#
      • 1...Sbd4
        • 2.Sf7#
      • 1...Sed4
        • 2.Sd3#
      • 1...Sf4
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(f);::S(K)
    • S(k);N_SPINR(a)::S(K),XR(j)
    • S(k);::S(K),XR(j)
  • Tries
    • Try
      • S(K);XS(k)
      • Threat
        • QAR1(C)
      • Vars
        • S(f);N_GUARD::QAB1(C),XS(f)
        • S(f);N_GUARD::QAB1(C)
      • Refutation
        • R(j);CHECK,XS(K)
    • Try
      • Q(C);CHECK
      • Vars
        • K(g);N_SPINR(a),P-FLIGHT,P_SPINS(f),XP(H)::R(B)
      • Refutation
        • P(m);XQ(C)
  • Actual
    • Q(C);P_PINP(d)
    • Threat
      • R1(B)
    • Vars
      • K(g);N_SPINP(d),N_SPINR(a),P-FLIGHT,P_SPINS(f),XP(H)::R(B)
      • S(f);::S(A)
      • S(f);::S(K)
      • S(k);::S(A)
      • S(k);N_SPINR(a)::S(K),XR(j)
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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).