MESON Chess Problem Database

Problem Display
PID: 231345 (1n6/5p1B/6b1/1QNkBR2/KP3P2/8/N4n2/1rr5 w - - 0 1)

Keirans, Peteris

Shakhmaty, 1927

1n6/5p1B/6b1/1QNkBR2/KP3P2/8/N4n2/1rr5

#2

9 + 7

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb4+
      • 2.Sxb4#
    • 1...Rd1
      • 2.Sc3#
    • 1...Re1
      • 2.Sc3#
    • 1...Rf1
      • 2.Sc3#
    • 1...Rg1
      • 2.Sc3#
    • 1...Rh1
      • 2.Sc3#
    • 1...Rc3
      • 2.Sxc3#
  • Tries
    • 1.Qd3+?
      • 1...Kc6
        • 2.Rf6#
        • 2.Qd6#
      • 1...Sxd3!
    • 1.Qd7+?
      • 1...Kc4
        • 2.Qd4#
      • 1...Sxd7!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Rd6#
      • 1...Rxb4+
        • 2.Sxb4#
      • 1...Bc2+
        • 2.Sb3#
      • 1...Rxc5
        • 2.Sc3#
      • 1...Se4
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(a);CHECK,XP(C)::S(A),XR(a)
    • R(b);N_GUARD::S(A)
    • R(b);N_GUARD::S(A),XR(b)
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • S(c);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • S(g);XQ(E)
  • Actual
    • R(H);
    • Threat
      • R1(H)
    • Vars
      • R(a);CHECK,XP(C)::S(A),XR(a)
      • B(e);CHECK,S_CUTR(b)::QAR(E)+S(F)
      • R(b);N_GUARD,P_SPINR(b),XS(F)::S(A)
      • S(c);N_GUARD,S_CUTB(e)::QAR2(E)
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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).