MESON Chess Problem Database

Problem Display
PID: 177886 (1q2N3/1b2Q1BB/n1p5/5NPp/2RPPk2/5pbP/5p2/3R1K2 w - - 0 1)

Udalov, Boris J

2nd HM., Sahs (Latvia), 1982

1q2N3/1b2Q1BB/n1p5/5NPp/2RPPk2/5pbP/5p2/3R1K2

#2

12 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Be5+?
      • 1...Kxe4
        • 2.Sf6#
        • 2.d5#
      • 1...Qxe5!
    • 1.Bh6?
      • threat
        • 2.g6#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Bh4!
    • 1.Qd6+?
      • 1...Kxe4
        • 2.Sf6#
        • 2.d5#
      • 1...Kxg5
        • 2.Bf6#
        • 2.Bh6#
        • 2.Qh6#
      • 1...Qxd6!
    • 1.Qe5+?
      • 1...Kxg5
        • 2.Bf6#
        • 2.Bh6#
      • 1...Qxe5!
    • 1.d5?
      • threat
        • 2.e5#
      • 1...cxd5
        • 2.exd5#
      • 1...Qe5
        • 2.Bxe5#
      • 1...Qa7
        • 2.Be5#
      • 1...Sc5!
    • 1.e5?
      • threat
        • 2.d5#
      • 1...Ke4
        • 2.d5#
      • 1...Qxe5
        • 2.dxe5#
      • 1...Sc5
        • 2.dxc5#
      • 1...Qa7!
    • 1.g6?
      • threat
        • 2.Bh6#
      • 1...Bh4
        • 2.Qxh4#
      • 1...Qe5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qe3#
      • 1...Kxe4
        • 2.d5#
      • 1...Kxg5
        • 2.Bh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(J);CHECK
      • Refutation
        • Q(i);XB(J)
    • Try
      • B(J);
      • Threat
        • B(J)+P(H)
      • Vars
        • Q(i);N_GUARD::QAB1(I),XQ(i)
      • Refutation
        • B(c);
    • Try
      • Q(I);CHECK
      • Refutation
        • Q(i);XQ(I)
    • Try
      • Q(I);CHECK
      • Refutation
        • Q(i);XQ(I)
    • Try
      • P(E);
      • Threat
        • R(D)+P(F)
      • Vars
        • P(g);OGATE,XP(E)::R(D)+P(F),XP(g)
        • Q(i);N_GUARD::B(J),XQ(i)
        • Q(i);N_GUARD::B(J)
      • Refutation
        • S(f);
    • Try
      • P(F);
      • Threat
        • R(D)+P(E)
      • Vars
        • K(d);P-FLIGHT::R(D)+P(E)
        • Q(i);OGATE,XP(F)::R(D)+P(E),XQ(i)
        • S(f);OGATE::R(D)+P(E),XS(f)
      • Refutation
        • Q(i);
    • Try
      • P(H);
      • Threat
        • B(J)
      • Vars
        • B(c);N_GUARD::QAR2(I),XB(c)
      • Refutation
        • Q(i);
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • K(d);P-FLIGHT,XP(F)::R(D)+P(E)
      • K(d);OGATEB,S_FLIGHT,XP(H)::B(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).