MESON Chess Problem Database

Problem Display
PID: 249762 (1B2N2K/2N2Ppb/2p3q1/4k2n/2P1Bp2/3Q1Pp1/n2P4/1r6 w - - 0 1)

Berezhnoi, Yuri Mikhailovich

Stella Polaris, 1969

1B2N2K/2N2Ppb/2p3q1/4k2n/2P1Bp2/3Q1Pp1/n2P4/1r6

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qd6#
    • 1...Qxf7
      • 2.Qd6#
    • 1...Qg4
      • 2.Qd6#
    • 1...Qg5
      • 2.Qd6#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Sc1
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
    • 1...Sb4
      • 2.Qc3#
    • 1...Sf6
      • 2.Qd6#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Sb5+?
      • 1...Qd6
        • 2.Qxd6#
      • 1...Ke6!
    • 1.Se6+?
      • 1...Rxb8
        • 2.Qd6#
      • 1...Kxe6!
    • 1.Bf5?
      • threat
        • 2.Qe4#
      • 1...Qxf5
        • 2.Qd6#
      • 1...Re1
        • 2.Se6#
      • 1...Sf6
        • 2.Sb5#
      • 1...Sc3!
    • 1.Bxg6?
      • threat
        • 2.Qe4#
        • 2.Qd6#
      • 1...Re1
        • 2.Qd6#
      • 1...Sc3
        • 2.Qxc3#
        • 2.Qd6#
      • 1...Sf6
        • 2.Qd6#
      • 1...Bxg6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.d4#
      • 1...Qxe4
        • 2.Sb5#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Rd1
        • 2.Se6#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(h);N_GUARD::QAB1(B)
    • Q(h);N_GUARD,XP(G)::QAB1(B)
    • Q(h);N_GUARD::QAB1(B),XQ(h)
    • S(b);N_GUARD::QAB(B)
    • S(b);N_GUARD::QAB(B),XS(b)
    • S(f);S_CUTQ(h)::QAB1(B)
    • P(g);N_GUARD::QAR1(B)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(h);N_GUARD,P_SPINQ(h)::QAB1(B),XQ(h)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • R(a);P_PINS(I),XB(H)::QAB1(B)
      • Refutation
        • K(e);P-FLIGHT,XS(F)
    • Try
      • B(E);
      • Threat
        • QAR1(B)
      • Vars
        • Q(h);N_GUARD,SBLOCK,XB(E)::QAB1(B)
        • R(a);N_GUARD::B(H)+S(F)
        • S(f);S_CUTQ(h)::B(H)+S(F)
      • Refutation
        • S(b);
    • Try
      • B(E);XQ(h)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAB1(B)
        • S(f);::QAB1(B)
      • Refutation
        • B(j);XB(E)
  • Actual
    • Q(B);
    • Threat
      • P(A)
    • Vars
      • Q(h);N_GUARD,XB(E)::B(H)+S(F)
      • Q(h);N_GUARD::QAB1(B),XQ(h)
      • R(a);N_GUARD::B(H)+S(F)
      • P(g);N_GUARD::QAR1(B)
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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).