MESON Chess Problem Database

Problem Display
PID: 226993 (1N2rB2/4qPbK/P2n4/Ppk1n2R/1p1p4/pP1Q4/r1b5/2R1N2B w - - 0 1)

Freivogel, J

Schweizerische Schachzeitung, 1929

1N2rB2/4qPbK/P2n4/Ppk1n2R/1p1p4/pP1Q4/r1b5/2R1N2B

#2

12 + 12

15257 Kunstwerke auf 64 Feldern (1922-1966) (Ott, Kummer, Schudel) 1968

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Sd7#
    • 1...Qf6
      • 2.Sd7#
    • 1...Qxf8
      • 2.Sd7#
    • 1...Qd7
      • 2.Sxd7#
  • Tries
    • 1.Rxe5+?
      • 1...Qxe5
        • 2.Sd7#
      • 1...Bxe5!
    • 1.Qxc2+?
      • 1...Rxc2
        • 2.Sd3#
      • 1...Sc4!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Sd3#
      • 1...Se4
        • 2.Qc6#
      • 1...d3
        • 2.Qg1#
      • 1...Sc4
        • 2.Sd7#
      • 1...Qg5
        • 2.Bxd6#
      • 1...Sf5
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(j);N_GUARD,P_PINR(G)::S(K)
    • Q(j);N_GUARD::S(K)
    • Q(j);N_GUARD,XB(L)::S(K)
    • Q(j);N_GUARD::S(K),XQ(j)
  • Tries
    • Try
      • R(G);CHECK,XS(h)
      • Vars
        • Q(j);P_SPINS(i),XR(G)::S(K)
      • Refutation
        • B(k);P_PINP(I),XR(G)
    • Try
      • Q(E);CHECK,N_SPINQ(E),XB(b)
      • Vars
        • R(a);P_SPINR(a),XQ(E)::S(B)
      • Refutation
        • S(i);N_SPINS(h),P_SPINQ(j),P_SPINS(i)
  • Actual
    • Q(E);
    • Threat
      • S(B)
    • Vars
      • S(i);N_PINQ(E),P_SPINQ(j)::QAR1(E)
      • P(e);N_PINQ(E)::QAB(E)
      • S(i);N_SPINB(b),P_SPINQ(j)::S(K)
      • Q(j);N_SPINS(h),OGATE,P_SPINS(i)::B(L),XS(i)
      • S(i);N_PINQ(E),N_SPINS(h),P_SPINQ(j)::QAB1(E)
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).