MESON Chess Problem Database

Problem Display
PID: 262797 (K1N2Qn1/bB2p3/4P3/1pk2NR1/2p5/PP6/3qn3/3r4 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

3rd Prize, Szachy, 1971

K1N2Qn1/bB2p3/4P3/1pk2NR1/2p5/PP6/3qn3/3r4

#2

9 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.b4#
    • 1...Qe3
      • 2.b4#
    • 1...Qf4
      • 2.b4#
    • 1...Qxg5
      • 2.b4#
    • 1...Qa2
      • 2.b4#
    • 1...Qc2
      • 2.b4#
    • 1...Qd3
      • 2.b4#
    • 1...Qd4
      • 2.b4#
    • 1...Qd5
      • 2.b4#
    • 1...Qd6
      • 2.b4#
    • 1...Qd7
      • 2.b4#
    • 1...Qd8
      • 2.b4#
    • 1...Sc3
      • 2.b4#
  • Tries
    • 1.Qxe7+?
      • 1...Qd6
        • 2.b4#
      • 1...Sxe7!
    • 1.Qe8?
      • threat
        • 2.Qc6#
      • 1...Qd5
        • 2.b4#
      • 1...Qd6
        • 2.b4#
      • 1...Qd7
        • 2.b4#
      • 1...Sd4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qc7#
      • 1...Qxd8
        • 2.b4#
      • 1...b4
        • 2.Qa5#
      • 1...Qf4
        • 2.b4#
      • 1...Qa5
        • 2.Sd4#
      • 1...Qd5
        • 2.b4#
      • 1...Qd6
        • 2.b4#
      • 1...Qd7
        • 2.b4#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Sd4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::P(B)
    • Q(b);N_GUARD,XR(D)::P(B)
    • Q(b);N_GUARD,P_PINB(F)::P(B)
    • Q(b);N_GUARD,N_SPINP(h)::P(B)
    • Q(b);N_GUARD,P_PINS(H)::P(B)
    • S(c);S_CUTQ(b)::P(B)
  • Tries
    • Try
      • Q(I);CHECK,XP(h)
      • Vars
        • Q(b);P_SPINQ(b)::P(B)
      • Refutation
        • S(i);XQ(I)
    • Try
      • Q(I);N_PINP(h)
      • Threat
        • QAR1(I)
      • Vars
        • Q(b);N_GUARD,P_PINB(F)::P(B)
        • Q(b);N_GUARD::P(B)
      • Refutation
        • S(c);
  • Actual
    • Q(I);N_PINP(h)
    • Threat
      • QAR2(I)
    • Vars
      • Q(b);N_GUARD,P_PINS(H),XQ(I)::P(B)
      • P(e);OGATEB::QAR2(I)
      • Q(b);N_GUARD::P(B)
      • Q(b);N_GUARD::R(D)+S(C)
      • Q(b);N_GUARD,P_PINB(F)::P(B)
      • B(g);N_GUARD::QAB1(I),XB(g)
      • B(g);N_GUARD::QAB1(I)
      • S(c);S_CUTQ(b)::QAR1(I)
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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).