MESON Chess Problem Database

Problem Display
PID: 17937 (2N5/K2B4/1p6/k2n2BR/r2Q3q/P2r4/2n3b1/2N3b1 w - - 0 1)

Issler, Werner

Jorgensen, Walther Martinus Johannes

Kaul, Karl

Petrovic, Nenad

Volkmann, Albert

Die Schwalbe, 1952

2N5/K2B4/1p6/k2n2BR/r2Q3q/P2r4/2n3b1/2N3b1

#2

8 + 9

3105 FIDE Album (1945-1955) 1964
15593 170 Skakopgaver (Jorgensen) 1975

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qxa4#
    • 1...Qf2
      • 2.Qxa4#
    • 1...Qg3
      • 2.Qxa4#
    • 1...Qxg5
      • 2.Qxa4#
    • 1...Qh1
      • 2.Qxa4#
    • 1...Qh2
      • 2.Qxa4#
    • 1...Qh3
      • 2.Qxa4#
    • 1...Qxh5
      • 2.Qxa4#
    • 1...Rd1
      • 2.Sb3#
    • 1...Rd2
      • 2.Sb3#
    • 1...Rb3
      • 2.Sxb3#
    • 1...Rdxd4
      • 2.Sb3#
    • 1...Be4
      • 2.Qxa4#
    • 1...Sc3
      • 2.Sb3#
    • 1...Se3
      • 2.Qxb6#
    • 1...Sf4
      • 2.Qxa4#
    • 1...Sf6
      • 2.Bd2#
    • 1...Sc7
      • 2.Bd2#
    • 1...Se7
      • 2.Bd2#
  • Tries
    • 1.Qc3+?
      • 1...Qb4
        • 2.Sb3#
      • 1...Rb4
        • 2.Sb3#
      • 1...Scb4
        • 2.Sb3#
      • 1...Sxc3
        • 2.Sb3#
      • 1...Sdb4
        • 2.Sb3#
      • 1...Rxc3!
    • 1.Qxb6+?
      • 1...Sxb6
        • 2.Bd2#
      • 1...Bxb6+!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Sb7#
      • 1...Sc3
        • 2.Sb3#
      • 1...Sde3
        • 2.Qxb6#
      • 1...Sdb4
        • 2.Sc4#
      • 1...Sf4
        • 2.Qxa4#
      • 1...Sf6
        • 2.Bd2#
      • 1...Sc7
        • 2.Bd2#
      • 1...Se7
        • 2.Bd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 13
  • Sets
    • Q(f);N_GUARD::QAR1(C),XR(e)
    • Q(f);N_GUARD,XB(D)::QAR1(C),XR(e)
    • Q(f);N_GUARD,SBLOCK,XR(E)::QAR1(C),XR(e)
    • R(d);N_GUARD::S(A)
    • R(d);N_GUARD::S(A),XR(d)
    • R(d);N_GUARD,XQ(C)::S(A)
    • B(c);S_CUTQ(f)::QAR1(C),XR(e)
    • S(h);S_CUTR(d)::S(A)
    • S(h);N_GUARD,S_CUTB(a)::QAB1(C),XP(i)
    • S(h);S_CUTQ(f)::QAR1(C),XR(e)
    • S(h);::R(E)+B(D),DCHECK
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::S(A)
        • R(e);P_SPINR(e)::S(A)
        • S(b);P_SPINS(b)::S(A)
        • S(h);XQ(C)::S(A)
        • S(h);P_SPINS(h)::S(A)
      • Refutation
        • R(d);XQ(C)
    • Try
      • Q(C);CHECK,P_SPINQ(C),XP(i)
      • Vars
        • S(h);XQ(C)::R(E)+B(D),DCHECK
      • Refutation
        • B(a);CHECK,XQ(C)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • S(h);S_CUTR(d)::S(A)
      • S(h);N_GUARD,S_CUTB(a)::QAB1(C),XP(i)
      • S(h);S_CUTR(e)::S(H)
      • S(h);S_CUTQ(f)::QAR1(C),XR(e)
      • S(h);::R(E)+B(D),DCHECK
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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).