MESON Chess Problem Database

Problem Display
PID: 231317 (8/1rnpN3/p7/6BK/rkP3R1/pNp5/8/1R6 w - - 0 1)

Krasni, Anatoly Savelevich

64 Shakhmatnoe obozrenie, 1927

8/1rnpN3/p7/6BK/rkP3R1/pNp5/8/1R6

#2

7 + 8

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.c5#
    • 1...Sb5
      • 2.Sd5#
    • 1...Sd5
      • 2.Sxd5#
    • 1...Se6
      • 2.Sd5#
    • 1...Sa8
      • 2.Sd5#
    • 1...Se8
      • 2.Sd5#
    • 1...c2
      • 2.Bd2#
    • 1...d5
      • 2.Sc6#
    • 1...d6
      • 2.Sc6#
  • Tries
    • 1.Sa5+?
      • 1...Kc5
        • 2.Sxb7#
      • 1...Kxa5!
    • 1.Sc5+?
      • 1...Ka5
        • 2.Sxb7#
      • 1...Kxc5!
  • Keys
    • 1.Be3!
      • threat
        • 2.Bc5#
      • 1...Ra5+
        • 2.Sc5#
      • 1...Rb5+
        • 2.c5#
      • 1...c2
        • 2.Bd2#
      • 1...Se6
        • 2.Sd5#
      • 1...d6
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(f);P_PINB(E),SBLOCK::R(D)+P(C)
    • S(g);N_GUARD::S(G)
    • S(g);N_GUARD::S(G),XS(g)
    • P(b);OGATEB::B(E)
    • P(h);N_GUARD::S(G)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(d);S_FLIGHT::S(B),XR(f)
      • Refutation
        • K(d);S_FLIGHT,XS(B)
    • Try
      • S(B);CHECK
      • Vars
        • K(d);S_FLIGHT::S(B),XR(f)
      • Refutation
        • K(d);S_FLIGHT,XS(B)
  • Actual
    • B(E);
    • Threat
      • B(E)
    • Vars
      • R(c);CHECK,SBLOCK::R(A)+S(B)
      • R(f);CHECK,SBLOCK::R(D)+P(C)
      • P(b);OGATEB::B(E)
      • S(g);N_GUARD::S(G)
      • P(h);N_GUARD::S(G)
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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).