MESON Chess Problem Database

Problem Display
PID: 99029 (1nK1Q3/1NnPR2r/8/1Bpk1p2/8/2P2P2/4P2q/6b1 w - - 0 1)

Balashov, Evgeny Fedorovich

Sakkelet, 1994

1nK1Q3/1NnPR2r/8/1Bpk1p2/8/2P2P2/4P2q/6b1

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Rxe5#
    • 1...Qh1
      • 2.Re5#
    • 1...Qf2
      • 2.Re5#
    • 1...Qg2
      • 2.Re5#
    • 1...Qh3
      • 2.Re5#
    • 1...Qh4
      • 2.Re5#
    • 1...Qh5
      • 2.Re5#
    • 1...Qh6
      • 2.Re5#
    • 1...Bd4
      • 2.c4#
    • 1...f4
      • 2.Re5#
  • Tries
    • 1.Re4?
      • threat
        • 2.c4#
      • 1...Qxe2
        • 2.Qe5#
      • 1...Sxb5
        • 2.Qe6#
      • 1...fxe4
        • 2.Qxe4#
        • 2.fxe4#
      • 1...c4!
    • 1.Qf7+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Rxf7!
    • 1.Qg8+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Rf7!
    • 1.d8Q+?
      • 1...Qd6
        • 2.Re5#
        • 2.Qxd6#
      • 1...Sd7!
    • 1.d8R+?
      • 1...Qd6
        • 2.Re5#
        • 2.Rxd6#
      • 1...Sd7!
  • Keys
    • 1.e4+!
      • 1...fxe4
        • 2.fxe4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • Q(b);N_GUARD::R1(G),XQ(b)
    • Q(b);N_GUARD::R1(G)
    • B(a);SBLOCK::P(B)
    • P(e);S_CUTQ(b)::R1(G)
  • Tries
    • Try
      • R(G);
      • Threat
        • P(B)
      • Vars
        • Q(b);N_GUARD,XP(A)::QAR1(I)
        • S(f);N_GUARD,XB(D)::QAB1(I)
      • Refutation
        • P(c);
    • Try
      • Q(I);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(I),XS(f)
      • Refutation
        • R(g);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(I),XS(f)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • P(F);CHECK
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • P(F);CHECK
      • Refutation
        • S(h);P_SPINS(h)
  • Actual
    • P(A);CHECK
    • Vars
      • P(e);OGATE,XP(A)::P(C),XP(e)
HTML5 logo

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).