MESON Chess Problem Database

Problem Display
PID: 259697 (8/2p4Q/5p2/1N1p1r1p/b4k2/2R2N1K/5B2/2n2R2 w - - 0 1)

Birbrager, Isaak S

Pravda Vostoka, 1950

(First published on Sat Apr 8 1950)

8/2p4Q/5p2/1N1p1r1p/b4k2/2R2N1K/5B2/2n2R2

#2

7 + 8

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Bg3#
    • 1...Rg5
      • 2.Be3#
    • 1...h4
      • 2.Qxh4#
  • Tries
    • 1.Sfd4?
      • threat
        • 2.Qxf5#
      • 1...Ke4
        • 2.Qxf5#
      • 1...Ke5
        • 2.Qxf5#
      • 1...Kg5
        • 2.Se6#
        • 2.Bh4#
      • 1...Re5
        • 2.Be3#
        • 2.Bh4#
      • 1...Rg5
        • 2.Bg3#
      • 1...Bc2!
    • 1.Sd6?
      • threat
        • 2.Be3#
        • 2.Bg3#
        • 2.Qxf5#
      • 1...Sd3
        • 2.Qxf5#
      • 1...Bc2
        • 2.Be3#
        • 2.Bg3#
      • 1...Re5
        • 2.Bg3#
      • 1...Rg5
        • 2.Be3#
      • 1...Bd7
        • 2.Be3#
        • 2.Bg3#
      • 1...Se2
        • 2.Be3#
        • 2.Qxf5#
      • 1...d4
        • 2.Bg3#
        • 2.Qxf5#
      • 1...h4
        • 2.Be3#
        • 2.Qxf5#
        • 2.Qxh4#
      • 1...cxd6!
    • 1.Qh6+?
      • 1...Ke4
        • 2.Re3#
        • 2.Qe3#
      • 1...Rg5!
    • 1.Qxc7+?
      • 1...Ke4
        • 2.Sd2#
        • 2.Re3#
      • 1...Re5!
  • Keys
    • 1.Bg3+!
      • 1...Ke4
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(e);::B(B)
    • P(f);OGATE::QAR2(G),XP(f)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(G),XR(e)
      • Vars
        • K(c);P-FLIGHT,P_SPINR(e)::QAB1(G),XR(e)
        • K(c);S_FLIGHT::QAR1(G),XR(e)
        • R(e);SBLOCK::R(A)+B(B),DCHECK
      • Refutation
        • B(b);
    • Try
      • S(F);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);::QAR1(G),XR(e)
        • R(e);::B(B)
      • Refutation
        • P(h);XS(F)
    • Try
      • Q(G);CHECK
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • Q(G);CHECK,XP(h)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • B(B);CHECK
    • Vars
      • K(c);N_GUARD,P-FLIGHT,P_SPINR(e)::S(D)
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).