MESON Chess Problem Database

Problem Display
PID: 17923 (6n1/Q7/3p4/1pqP4/4PKN1/3p3B/3P3p/3N2kr w - - 0 1)

Keirans, Arturs

1st Place, USSR Championship, 1951

6n1/Q7/3p4/1pqP4/4PKN1/3p3B/3P3p/3N2kr

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2+
      • 2.Qxf2#
    • 1...Qe3+
      • 2.Qxe3#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qb6
      • 2.Qxb6#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Qa1#
      • 1...Qf2+
        • 2.Qxf2#
      • 1...Qe3+
        • 2.Qxe3#
      • 1...Qxa7!
    • 1.Se5?
      • threat
        • 2.Sf3#
        • 2.Qg7#
      • 1...Qf2+
        • 2.Sf3#
        • 2.Qxf2#
      • 1...Qe3+
        • 2.Qxe3#
      • 1...Qxa7
        • 2.Sf3#
      • 1...Sf6
        • 2.Sf3#
      • 1...Sh6
        • 2.Sf3#
      • 1...Se7
        • 2.Sf3#
      • 1...dxe5+!
    • 1.Qg7?
      • threat
        • 2.Sgf2#
        • 2.Sge3#
        • 2.Se5#
        • 2.Sf6#
        • 2.Sh6#
      • 1...Qf2+
        • 2.Sgxf2#
      • 1...Qe3+
        • 2.Sgxe3#
      • 1...Qxd5
        • 2.Se5#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Qd4
        • 2.Se5#
        • 2.Sf6#
        • 2.Qxd4#
      • 1...Qa7
        • 2.Qxa7#
      • 1...Qc3
        • 2.Se5#
        • 2.Sf6#
      • 1...Qc7
        • 2.Qd4#
      • 1...Qc8
        • 2.Qd4#
      • 1...Sh6
        • 2.Sxh6#
      • 1...Se7!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sc3#
      • 1...Qf2+
        • 2.Sdxf2#
      • 1...Qe3+
        • 2.Sdxe3#
      • 1...Qa3
        • 2.Qd4#
      • 1...Qb4
        • 2.Sb2#
      • 1...Qa7
        • 2.Qxa7#
      • 1...Qc1
        • 2.Qd4#
      • 1...Qc2
        • 2.Qd4#
      • 1...Qc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(f);CHECK,OGATE::QAB1(H),XQ(f)
    • Q(f);CHECK,OGATE::QAB(H),XQ(f)
    • Q(f);OGATE,P_PINP(D)::QAB(H),XQ(f)
    • Q(f);OGATEB::QAB(H),XQ(f)
  • Tries
    • Try
      • S(A);
      • Threat
        • QAR(H)
      • Vars
        • Q(f);CHECK,OGATE::QAB1(H),XQ(f)
        • Q(f);CHECK,OGATE::QAB(H),XQ(f)
      • Refutation
        • Q(f);N_SPINQ(f),XQ(H)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);CHECK,OGATE::QAB(H),XQ(f)
        • Q(f);N_SPINQ(f),XQ(H)::S(F)
        • S(h);::S(F)
      • Refutation
        • P(g);CHECK,XS(F)
    • Try
      • Q(H);N_PINQ(f)
      • Threat
        • DUALS(5)
      • Vars
        • Q(f);CHECK::QAR(H)+S(F),XQ(f)
        • Q(f);XP(G)::QAR(H)+S(F)
        • S(h);::QAR(H)+S(F),XS(h)
        • Q(f);OGATEB::QAB(H),XQ(f)
        • Q(f);N_GUARD::QAB(H)
      • Refutation
        • S(h);
  • Actual
    • Q(H);N_PINQ(f)
    • Threat
      • QAR(H)+S(A)
    • Vars
      • Q(f);CHECK,N_GUARD::QAR(H)+S(A),XQ(f)
      • Q(f);N_GUARD::QAB(H)
      • Q(f);N_GUARD,P_PINP(D)::QAR(H)+S(A)
      • Q(f);OGATEB::QAB(H),XQ(f)
      • Q(f);N_GUARD,P_PINP(B)::QAB(H)
      • Q(f);::QAR(H)+S(A),XQ(f)
HTML5 logo

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).