MESON Chess Problem Database

Problem Display
PID: 78068 (2N1R3/5p1b/1P4R1/2pk1r2/2p5/2P1p3/2Kp3b/3Q1Nqn w - - 0 1)

Letzen, Einar

Prize, Norsk Sjakkblad, 1926

2N1R3/5p1b/1P4R1/2pk1r2/2p5/2P1p3/2Kp3b/3Q1Nqn

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Sxe3#
    • 1...Qg4
      • 2.Sxe3#
    • 1...Rf2
      • 2.Sxe3#
    • 1...Rf3
      • 2.Qxf3#
    • 1...Rg5
      • 2.Qf3#
    • 1...Rh5
      • 2.Qf3#
    • 1...Bf4
      • 2.Qf3#
    • 1...Bd6
      • 2.Rxd6#
    • 1...Sf2
      • 2.Sxe3#
    • 1...Sg3
      • 2.Rd6#
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qe4#
      • 1...d1Q+
        • 2.Qxd1#
      • 1...d1B+
        • 2.Qxd1#
      • 1...Qxg4
        • 2.Sxe3#
      • 1...Qg2
        • 2.Sxe3#
      • 1...Rf4
        • 2.Qd7#
      • 1...Re5
        • 2.Rd8#
      • 1...Bf4
        • 2.Qf3#
      • 1...Be5
        • 2.Se7#
      • 1...Sf2
        • 2.Sxe3#
      • 1...Sg3
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::S(B),XP(e)
    • R(i);P_PINR(F),S_CUTQ(a)::S(B),XP(e)
    • R(i);N_GUARD,P_PINR(F)::QAB(A),XR(i)
    • R(i);N_GUARD,P_PINR(F)::QAB(A)
    • B(d);S_CUTR(i)::QAB(A)
    • B(d);N_GUARD::R1(F),XB(d)
    • S(b);S_CUTQ(a)::S(B),XP(e)
    • S(b);S_CUTB(d)::R1(F)
  • Actual
    • Q(A);N_PINP(c)
    • Threat
      • QAB1(A)
    • Vars
      • P(c);CHECK,OGATEB::QAR(A),XQ(c)
      • P(c);CHECK,OGATEB::QAR(A),XB(c)
      • Q(a);N_GUARD,XQ(A)::S(B),XP(e)
      • Q(a);N_GUARD::S(B),XP(e)
      • R(i);OGATE,P_PINR(F)::QAR2(A)
      • R(i);P_PINR(F),SBLOCK,S_CUTB(d)::R(H)
      • B(d);S_CUTR(i)::QAB(A)
      • B(d);SBLOCK::S(G)
      • S(b);S_CUTQ(a)::S(B),XP(e)
      • S(b);S_CUTB(d)::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).