MESON Chess Problem Database

Problem Display
PID: 35185 (2QNR3/1r1n2pq/8/1p2Nn2/2Pk1p2/R4B2/8/Kb2B3 w - - 0 1)

Zagoruyko, Leonid Ivanovich

1st Prize, Georgian Sports Committee, 1948

2QNR3/1r1n2pq/8/1p2Nn2/2Pk1p2/R4B2/8/Kb2B3

#2

9 + 9

113 Shakhmaty v SSSR 1949
3105 FIDE Album (1945-1955) 1964
6004 Henk Hagedoorn Solving Ty. 2004
133 The Problemist Supplement 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Rd3#
    • 1...Bd3
      • 2.Rxd3#
    • 1...Se3
      • 2.Bc3#
    • 1...Sg3
      • 2.Bf2#
    • 1...Sh4
      • 2.Bf2#
    • 1...Sd6
      • 2.Bf2#
    • 1...Sh6
      • 2.Bf2#
    • 1...Sc5
      • 2.Sdc6#
    • 1...Sxe5
      • 2.Se6#
    • 1...bxc4
      • 2.Qxc4#
  • Tries
    • 1.Sec6+?
      • 1...Kxc4
        • 2.Rc3#
      • 1...Kc5!
    • 1.Qc5+?
      • 1...Sxc5
        • 2.Sdc6#
      • 1...Kxc5!
    • 1.cxb5?
      • threat
        • 2.Qc3#
        • 2.Qc4#
      • 1...Sxe5
        • 2.Se6#
        • 2.Qc3#
      • 1...Bd3
        • 2.Rxd3#
      • 1...Be4
        • 2.Qc4#
      • 1...Se7
        • 2.Qc3#
      • 1...Qg8
        • 2.Qc3#
      • 1...Ba2
        • 2.Rd3#
        • 2.Qc3#
      • 1...Se3
        • 2.Bc3#
        • 2.Qc3#
      • 1...Sd6
        • 2.Bf2#
        • 2.Qc3#
      • 1...Sc5
        • 2.Sdc6#
      • 1...Sb6
        • 2.Qc3#
      • 1...Rc7!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Re4#
      • 1...Bxd3
        • 2.Bc3#
      • 1...bxc4
        • 2.Sc6#
      • 1...Se7
        • 2.Bf2#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Se5
        • 2.Qc5#
      • 1...Se3
        • 2.Se6#
      • 1...Sg3
        • 2.Bf2#
      • 1...Sh4
        • 2.Bf2#
      • 1...Sd6
        • 2.Bf2#
      • 1...Sh6
        • 2.Bf2#
      • 1...Sf6
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::R1(C)
    • B(a);N_GUARD::R1(C),XB(a)
    • S(e);SBLOCK::B(B)
    • S(e);N_GUARD::B(B)
    • S(g);SBLOCK::S(H)
    • S(g);SBLOCK,XS(F)::S(H)
    • P(d);OGATE,XP(E)::QAR1(G),XP(d)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(E)::R1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • S(g);SBLOCK,XQ(G)::S(H)
      • Refutation
        • K(b);S_FLIGHT,XQ(G)
    • Try
      • P(E);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);N_GUARD::R1(C),XB(a)
        • B(a);::QAR1(G)
        • S(e);::QAB1(G)
        • Q(i);::QAB1(G)
        • S(g);SBLOCK::S(H)
        • S(g);::QAB1(G)
      • Refutation
        • R(f);
  • Actual
    • S(F);
    • Threat
      • R1(I)
    • Vars
      • B(a);SBLOCK,XS(F)::B(B)
      • P(d);SBLOCK,XP(E)::S(H)
      • S(e);N_GUARD::B(B)
      • S(g);N_GUARD::QAB1(G),XS(g)
      • S(g);N_GUARD::QAB1(G)
      • S(e);SBLOCK::S(H)
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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).