MESON Chess Problem Database

Problem Display
PID: 257282 (2KN4/1p1NR2r/5B1q/1rR1p1Pp/1ppkP3/1p1n2Q1/3p1p2/1Bn1b3 w - - 0 1)

Obert, Karl

Wiener Schachzeitung, 1887

2KN4/1p1NR2r/5B1q/1rR1p1Pp/1ppkP3/1p1n2Q1/3p1p2/1Bn1b3

#2

10 + 15

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Bxe5#
    • 1...Sb2
      • 2.Se6#
      • 2.Bxe5#
    • 1...Sf4
      • 2.Bxe5#
    • 1...Sxc5
      • 2.Bxe5#
  • Tries
    • 1.Sc6+?
      • 1...Kc3
        • 2.Bxe5#
      • 1...Kxe4
        • 2.Rexe5#
      • 1...bxc6!
    • 1.Se6+?
      • 1...Kc3
        • 2.Bxe5#
      • 1...Kxe4!
    • 1.Bxe5+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...Sxe5!
    • 1.Rd5+?
      • 1...Kc3
        • 2.Bxe5#
      • 1...Kxe4
        • 2.Rexe5#
      • 1...Rxd5!
    • 1.Qe3+?
      • 1...Kc3
        • 2.Bxe5#
      • 1...Kxe3!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Rxc4#
      • 1...Rxc5+
        • 2.Sec6#
      • 1...Kc3
        • 2.Sg6#
      • 1...Kxe4
        • 2.Sef7#
      • 1...Kxc5
        • 2.Sd7#
      • 1...Sxc5
        • 2.Sec6#
        • 2.Sg6#
      • 1...Sxe5
        • 2.Se6#
      • 1...Sb2
        • 2.Se6#
      • 1...c3
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • K(i);N_GUARD,N_SPINP(k),P_SPINP(h),P_SPINS(f),S_FLIGHT::B(F),XP(k)
    • S(f);N_GUARD::B(F),XP(k)
    • S(f);N_GUARD,XR(D)::B(F),XP(k)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • K(i);N_GUARD,N_SPINP(k),P_SPINP(h),P_SPINS(f),S_FLIGHT::B(F),XP(k)
        • K(i);N_GUARD,P-FLIGHT,P_SPINS(f),S_CUTP(n),XP(C)::R1(H),XP(k)
      • Refutation
        • P(n);XS(J)
    • Try
      • S(J);CHECK
      • Vars
        • K(i);N_GUARD,N_SPINP(k),P_SPINP(h),P_SPINS(f),S_FLIGHT::B(F),XP(k)
      • Refutation
        • K(i);N_SPINP(k),P-FLIGHT,P_SPINS(f),XP(C)
    • Try
      • B(F);CHECK,XP(k)
      • Vars
        • K(i);P-FLIGHT,P_SPINS(f),XP(C)::QAR1(B)
      • Refutation
        • S(f);XB(F)
    • Try
      • R(D);CHECK
      • Vars
        • K(i);N_GUARD,P_SPINS(f),S_FLIGHT::B(F),XP(k)
        • K(i);N_GUARD,P-FLIGHT,P_SPINS(f),S_CUTR(j),XP(C)::R1(H),XP(k)
      • Refutation
        • R(j);XR(D)
    • Try
      • Q(B);CHECK
      • Vars
        • K(i);N_GUARD,N_SPINP(k),P_SPINP(h),P_SPINS(f),S_FLIGHT::B(F),XP(k)
      • Refutation
        • K(i);N_SPINP(k),S_FLIGHT,XQ(B)
  • Actual
    • S(G);XP(k)
    • Threat
      • R1(D),XP(h)
    • Vars
      • R(j);CHECK,SBLOCK,XR(D)::B(F)+S(G),DCHECK
      • K(i);N_GUARD,P_SPINP(h),P_SPINS(f),S_FLIGHT::B(F)+S(G)
      • K(i);N_GUARD,P-FLIGHT,P_SPINS(f),S_CUTQ(m),XP(C)::R(H)+S(G)
      • K(i);S_CUTQ(m),S_CUTS(f),S_FLIGHT,XR(D)::S(G)
      • S(f);P_SPINS(f),XS(G)::S(J)
      • S(f);::S(J)
      • P(h);::R1(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).