MESON Chess Problem Database

Problem Display
PID: 263875 (6Nr/3p4/1n1r1pR1/Qq5k/1p4R1/5N2/8/3Bb2K w - - 0 1)

Isaev, Leonid Antonovich

3rd Comm., Tijdschrift vd NSB, 1929

6Nr/3p4/1n1r1pR1/Qq5k/1p4R1/5N2/8/3Bb2K

#2

7 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxf5#
    • 1...Rxd1
      • 2.Sxf6#
    • 1...Rd2
      • 2.Sxf6#
    • 1...Rd3
      • 2.Sxf6#
    • 1...Rd4
      • 2.Sxf6#
    • 1...Rd5
      • 2.Sxf6#
    • 1...f5
      • 2.R4g5#
      • 2.R6g5#
  • Tries
    • 1.Qxb5+?
      • 1...Rd5
        • 2.Sxf6#
      • 1...f5
        • 2.R4g5#
        • 2.R6g5#
        • 2.Qxf5#
      • 1...Sd5!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Rd4#
      • 1...Qd5+
        • 2.Re4#
      • 1...Rxd1
        • 2.Sxf6#
      • 1...Bxh4
        • 2.R4g5#
      • 1...Rd2
        • 2.Sxf6#
      • 1...Rd3
        • 2.Sxf6#
      • 1...Rd4
        • 2.Sxf6#
        • 2.Rxd4#
      • 1...Rd5
        • 2.Sxf6#
      • 1...Re6
        • 2.Re4#
      • 1...Sd5
        • 2.Rc4#
      • 1...f5
        • 2.R6g5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::QAR2(E),XQ(c)
    • R(f);N_GUARD,XB(A)::S(G),XP(g)
    • R(f);N_GUARD::S(G),XP(g)
    • R(f);N_GUARD,N_SPINQ(c)::S(G),XP(g)
  • Tries
    • Try
      • Q(E);CHECK,XQ(c)
      • Vars
        • R(f);P_SPINR(f)::S(G),XP(g)
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • S(C);
    • Threat
      • B(A)+R(D)
    • Vars
      • Q(c);CHECK,S_CUTR(f)::B(A)+R(D)
      • R(f);N_GUARD,XB(A)::S(G),XP(g)
      • B(a);SBLOCK,XS(C)::B(A)+R(D),DCHECK
      • R(f);N_GUARD::S(G),XP(g)
      • R(f);N_GUARD,N_SPINQ(c)::S(G),XP(g)
      • R(f);N_GUARD::B(A)+R(D)
      • S(e);N_SPINQ(c),S_CUTR(f)::B(A)+R(D)
      • P(g);N_GUARD,N_SPINQ(c),S_CUTQ(c)::R1(F)
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).