MESON Chess Problem Database

Problem Display
PID: 67525 (1NNQ4/B4p2/p2P1R2/4kP2/pP4nK/1bpP1R1p/B1n5/4r3 w - - 0 1)

Marker, Yuri

Pankratiev, Aleksandr Nikolaevich

4th HM., Die Schwalbe, 1989

1NNQ4/B4p2/p2P1R2/4kP2/pP4nK/1bpP1R1p/B1n5/4r3

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qa5#
    • 1...Bd5
      • 2.Sd7#
    • 1...Be6
      • 2.Sc6#
  • Tries
    • 1.Sb6?
      • threat
        • 2.Sc6#
      • 1...Kd4
        • 2.Sc6#
      • 1...Bd5
        • 2.S6d7#
      • 1...Sd4
        • 2.S8d7#
      • 1...Sxb4!
    • 1.Bxb3?
      • threat
        • 2.Sc6#
        • 2.Sd7#
        • 2.Qe7#
      • 1...Sxb4
        • 2.Sd7#
        • 2.Qe7#
      • 1...Sxf6
        • 2.Sc6#
        • 2.Qe7#
      • 1...Sd4
        • 2.Sd7#
      • 1...axb3!
    • 1.Re6+?
      • 1...Kd5
        • 2.Se7#
        • 2.Qa5#
      • 1...Bxe6
        • 2.Sc6#
      • 1...fxe6!
    • 1.Qa5+?
      • 1...Bd5
        • 2.Sd7#
      • 1...Kxf6!
    • 1.Qe7+?
      • 1...Be6
        • 2.Sc6#
        • 2.Sd7#
      • 1...Kd5!
    • 1.Qe8+?
      • 1...Kxf6
        • 2.Qh8#
      • 1...Be6
        • 2.Sd7#
      • 1...Kd5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sd7#
      • 1...Kxf6
        • 2.Qh8#
      • 1...Sxf6
        • 2.Sbc6#
      • 1...Be6
        • 2.Sec6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(h);P-FLIGHT,P_SPINB(c)::QAR(L)
    • B(c);::S(J)
  • Tries
    • Try
      • S(K);
      • Threat
        • S(J)
      • Vars
        • K(h);S_FLIGHT::S(J)
        • B(c);::S(K)
        • S(b);SBLOCK::S(J)
      • Refutation
        • S(b);XP(D)
    • Try
      • B(A);XB(c)
      • Threat
        • DUALS(3)
      • Vars
        • S(b);::S(J)
      • Refutation
        • P(f);XB(A)
    • Try
      • R(H);CHECK
      • Vars
        • B(c);XR(H)::S(J)
      • Refutation
        • P(j);XR(H)
    • Try
      • Q(L);CHECK
      • Vars
        • B(c);P_SPINB(c)::S(J)
      • Refutation
        • K(h);S_FLIGHT,XR(H)
    • Try
      • Q(L);CHECK
      • Refutation
        • K(h);P-FLIGHT,P_SPINB(c)
    • Try
      • Q(L);CHECK
      • Vars
        • K(h);OGATEB,S_FLIGHT,XR(H)::QAB(L)
        • B(c);P_SPINB(c)::S(J)
      • Refutation
        • K(h);P-FLIGHT,P_SPINB(c)
  • Actual
    • S(K);
    • Threat
      • S(J)
    • Vars
      • K(h);OGATEB,S_FLIGHT,XR(H)::QAB(L)
      • S(g);SBLOCK,XR(H)::S(J)
      • B(c);::S(K)
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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).