MESON Chess Problem Database

Problem Display
PID: 7936 (2R5/8/n1N1p3/R1bkPPqB/1p1Np3/1Kp1p3/4P3/Q7 w - - 0 1)

Mochalkin, Oleksandr Viktorovich

Postnikov, Oleksandr Borisovich

The Problemist, 1994

2R5/8/n1N1p3/R1bkPPqB/1p1Np3/1Kp1p3/4P3/Q7

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rd8#
    • 1...Qh6
      • 2.Rd8#
    • 1...Qd8
      • 2.Rxd8#
    • 1...Qg1
      • 2.Rd8#
    • 1...Qg2
      • 2.Rd8#
    • 1...Qg3
      • 2.Rd8#
    • 1...Qg4
      • 2.Rd8#
    • 1...Qxf5
      • 2.Rd8#
    • 1...Qxh5
      • 2.Rd8#
    • 1...Qg6
      • 2.Rd8#
    • 1...exf5
      • 2.Bf7#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Qd1#
      • 1...exf5
        • 2.Bf7#
      • 1...Sc7
        • 2.S2xb4#
      • 1...Qg1!
    • 1.Sxe6?
      • threat
        • 2.Qd1#
      • 1...Sc7
        • 2.Rxc5#
      • 1...Qg1
        • 2.Sf4#
      • 1...c2
        • 2.Qd4#
      • 1...Qxf5!
    • 1.Rxc5+?
      • 1...Kxc5
        • 2.Qa5#
      • 1...Sxc5+!
    • 1.Qd1?
      • threat
        • 2.Sc2#
        • 2.Sf3#
        • 2.Sxe6#
      • 1...Qxf5
        • 2.Sc2#
        • 2.Sf3#
        • 2.Sxf5#
        • 2.Rd8#
      • 1...exf5
        • 2.Bf7#
      • 1...Qg1
        • 2.Rd8#
      • 1...c2
        • 2.Sxc2#
      • 1...Sc7!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qd1#
      • 1...exf3
        • 2.Bxf3#
      • 1...exf5
        • 2.Bf7#
      • 1...Sc7
        • 2.Sxb4#
      • 1...Qg1
        • 2.Se7#
      • 1...c2
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(g);N_GUARD::R(J)
    • Q(g);N_GUARD::R(J),XQ(g)
    • Q(g);N_GUARD,XP(G)::R(J)
    • Q(g);N_GUARD,XB(H)::R(J)
    • P(i);OGATEB,XP(G)::B(H)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR(A)
      • Vars
        • P(i);OGATEB,XP(G)::B(H)
        • S(h);N_GUARD::S(D),XP(c)
      • Refutation
        • Q(g);
    • Try
      • S(D);XP(i)
      • Threat
        • QAR(A)
      • Vars
        • S(h);N_GUARD::R1(E),XB(e)
        • Q(g);N_GUARD::S(D)
        • P(a);OGATE::QAR1(A)
      • Refutation
        • Q(g);XP(G)
    • Try
      • R(E);CHECK,XB(e)
      • Vars
        • K(f);P-FLIGHT,XR(E)::QAR2(A)
      • Refutation
        • S(h);CHECK,XR(E)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • P(i);OGATEB,XP(G)::B(H)
        • Q(g);N_GUARD::R(J)
        • P(a);::QAR(A)+S(D),XP(a)
      • Refutation
        • S(h);
  • Actual
    • S(D);
    • Threat
      • QAR(A)
    • Vars
      • P(d);OGATE,XS(D)::B(H),XP(d)
      • P(i);OGATEB,XP(G)::B(H)
      • S(h);N_GUARD::S(I),XP(c)
      • Q(g);N_GUARD::S(I)
      • P(a);OGATE::QAR1(A)
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).