MESON Chess Problem Database

Problem Display
PID: 86273 (2kq2R1/Kn1r3R/Qp1pB3/nb1N4/N7/8/8/2r3b1 w - - 0 1)

Loshinski, Lev Ilich

Grossmejster, 1980

2kq2R1/Kn1r3R/Qp1pB3/nb1N4/N7/8/8/2r3b1

#2

7 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.Rxe8#
    • 1...Qf8
      • 2.Rxf8#
    • 1...Rc5
      • 2.Saxb6#
    • 1...Rc6
      • 2.Bxd7#
    • 1...Rc7
      • 2.Se7#
    • 1...Bh2
      • 2.Saxb6#
    • 1...Bf1
      • 2.Bxd7#
    • 1...Be2
      • 2.Bxd7#
    • 1...Bd3
      • 2.Bxd7#
    • 1...Bc4
      • 2.Bxd7#
    • 1...Bxa6
      • 2.Bxd7#
    • 1...Sb3
      • 2.Qxb7#
    • 1...Sc4
      • 2.Qxb7#
  • Tries
    • 1.Qxb6?
      • threat
        • 2.Se7#
      • 1...Bxb6+
        • 2.Saxb6#
      • 1...Sc5+
        • 2.Qc7#
      • 1...Sc6+!
  • Keys
    • 1.Rxd8+!
      • 1...Kxd8
        • 2.Rh8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 13
  • Sets
    • Q(j);OGATEB::R(G),XQ(j)
    • R(a);S_CUTB(b)::S(A),XP(e)
    • R(a);S_CUTB(d)::B(D),XR(h)
    • R(a);SBLOCK::S(B)
    • B(b);N_GUARD::S(A),XP(e)
    • B(d);N_GUARD::B(D),XR(h)
    • B(d);N_GUARD,N_SPINS(g),XQ(C)::B(D),XR(h)
    • S(c);N_GUARD::QAB1(C),XS(g)
  • Tries
    • Try
      • Q(C);N_PINS(g),P_SPINQ(C),XP(e)
      • Threat
        • S(B)
      • Vars
        • B(b);CHECK,XQ(C)::S(A),XB(b)
        • S(g);CHECK,N_PINQ(C)::QAR1(C)
      • Refutation
        • S(c);CHECK
  • Actual
    • R(G);CHECK,XQ(j)
    • Vars
      • K(i);N_SPINR(h),N_SPINS(g),P-FLIGHT,XR(G)::R(F)
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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).