MESON Chess Problem Database

Problem Display
PID: 123425 (r7/b3p3/1pP1k1B1/6P1/2NKN3/3Q4/2P2Pp1/7q w - - 0 1)

Ouzounov, E

Themes-64, 1959

r7/b3p3/1pP1k1B1/6P1/2NKN3/3Q4/2P2Pp1/7q

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Qh3#
    • 1...Qc1
      • 2.Qh3#
    • 1...Qe1
      • 2.Qh3#
    • 1...Qf1
      • 2.Qh3#
    • 1...Qg1
      • 2.Qh3#
    • 1...Qh3
      • 2.Qxh3#
  • Tries
    • 1.Bf7+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Kxf7!
    • 1.Qe3?
      • threat
        • 2.Sed2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sed6#
        • 2.Sf6#
      • 1...Qa1+
        • 2.Sc3#
      • 1...Qd1+
        • 2.Sed2#
      • 1...Qh8+
        • 2.Sf6#
      • 1...Rd8+
        • 2.Sed6#
      • 1...b5+
        • 2.Sc5#
      • 1...g1Q
        • 2.Sc5#
      • 1...g1S
        • 2.Sc5#
      • 1...g1B
        • 2.Sc5#
      • 1...g1R
        • 2.Sc5#
      • 1...Qc1
        • 2.Sed2#
        • 2.Sc5#
        • 2.Qh3#
      • 1...Qe1
        • 2.Sc5#
        • 2.Qh3#
      • 1...Qh2
        • 2.Sg3#
        • 2.Sc5#
      • 1...Qh3
        • 2.Sg3#
        • 2.Sc5#
        • 2.Qxh3#
      • 1...Bb8
        • 2.Sc5#
        • 2.Sed6#
      • 1...Qh4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sb2#
        • 2.Scd2#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sxb6#
        • 2.Scd6#
      • 1...Qa1+
        • 2.Sb2#
      • 1...Qd1+
        • 2.Scd2#
      • 1...Qh8+
        • 2.Se5#
      • 1...Rd8+
        • 2.Scd6#
      • 1...b5+
        • 2.Sb6#
      • 1...Qb1
        • 2.Sb2#
        • 2.Qh3#
      • 1...Qf1
        • 2.Qh3#
      • 1...Qh3
        • 2.Se3#
        • 2.Qxh3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::QAB(C)
    • Q(a);N_GUARD,P_PINP(B)::QAB(C)
    • Q(a);N_GUARD::QAB(C),XQ(a)
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR2(C)
      • Refutation
        • K(d);S_FLIGHT,XB(I)
    • Try
      • Q(C);
      • Threat
        • DUALS(6)
      • Vars
        • Q(a);CHECK::QAR(C)+S(F)
        • R(g);CHECK::QAR(C)+S(F)
        • P(c);CHECK::QAR(C)+S(F),DCHECK
        • P(b);::QAR(C)+S(F),DCHECK
      • Refutation
        • Q(a);P_PINS(F)
  • Actual
    • Q(C);
    • Threat
      • DUALS(8)
    • Vars
      • Q(a);CHECK::QAB(C)+S(D)
      • R(g);CHECK::QAB(C)+S(D)
      • P(c);CHECK::QAB(C)+S(D)
      • Q(a);N_GUARD::QAB(C)
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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).