MESON Chess Problem Database

Problem Display
PID: 6897 (4KBn1/3B1P1b/2p1Np2/8/p7/Nk2r2R/3P4/Q5b1 w - - 0 1)

Keres, Paul P

1st Prize, Schackvarlden, 1934

4KBn1/3B1P1b/2p1Np2/8/p7/Nk2r2R/3P4/Q5b1

#2

9 + 8

3147 Chess Problems: Introduction to an Art 1963
6479 Problemschach (Sidler) 1968
102 Probleemblad 1975
5395 Schach fur Nussknacker 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Rxc3#
    • 1...Rd3
      • 2.Qb1#
    • 1...Bb1
      • 2.Qxb1#
    • 1...Be4
      • 2.Sd4#
    • 1...f5
      • 2.Qb1#
  • Tries
    • 1.Rxe3+?
      • 1...Bd3
        • 2.Sd4#
        • 2.Rxd3#
        • 2.Qb1#
      • 1...Bxe3!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Rb4#
      • 1...Rxe6+
        • 2.Bxe6#
      • 1...Re4
        • 2.Qb1#
      • 1...Be4
        • 2.Sd4#
      • 1...Se7
        • 2.Sc5#
      • 1...c5
        • 2.Bxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(c);N_PINS(E),OGATE::R1(D),XR(c)
    • R(c);N_PINS(E),S_CUTB(g)::QAR2(A)
    • B(g);N_GUARD::QAR2(A),XB(g)
    • B(g);N_PINS(E)::S(E)
    • P(f);S_CUTB(g)::QAR2(A)
  • Tries
    • Try
      • R(D);CHECK,N_SPINS(E),XR(c)
      • Refutation
        • B(a);XR(D)
  • Actual
    • R(D);N_PINR(c)
    • Threat
      • R1(D)
    • Vars
      • R(c);CHECK,OGATE,XS(E)::B(F),XR(c)
      • R(c);S_CUTB(g)::QAR2(A)
      • B(g);N_PINS(E)::S(E)
      • S(h);N_PINS(E)::S(E)
      • P(e);OGATE::B(F),XP(d)
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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).