MESON Chess Problem Database

Problem Display
PID: 83572 (1K2R3/p4pq1/Q2B2p1/1n1kbRN1/8/prprp3/B1Nn4/5b2 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1921

1K2R3/p4pq1/Q2B2p1/1n1kbRN1/8/prprp3/B1Nn4/5b2

#2

8 + 14

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qc6#
    • 1...Rd4
      • 2.Sxe3#
    • 1...Sb1
      • 2.Bxb3#
    • 1...Sf3
      • 2.Bxb3#
    • 1...Se4
      • 2.Bxb3#
    • 1...Sd4+
      • 2.Sb4#
  • Tries
    • 1.Rfxe5+?
      • 1...Kc4
        • 2.Rc5#
        • 2.Rc8#
        • 2.Qxb5#
        • 2.Qa4#
        • 2.Qc6#
      • 1...Qxe5!
    • 1.Rexe5+?
      • 1...Kc4
        • 2.Rc5#
        • 2.Qxb5#
        • 2.Qa4#
        • 2.Qc6#
      • 1...Qxe5!
    • 1.Qb7+?
      • 1...Kc4
        • 2.Qc6#
      • 1...Kxd6!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Qxb5#
      • 1...Sd4+
        • 2.Sb4#
      • 1...Sxd6+
        • 2.Qb5#
      • 1...Sc7+
        • 2.Bb4#
      • 1...Kc4
        • 2.Qc6#
      • 1...Rd4
        • 2.Sxe3#
      • 1...Sc4
        • 2.Qb7#
      • 1...Se4
        • 2.Bxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(i);N_SPINB(j),P_SPINS(h),S_FLIGHT::QAR2(E)
    • R(f);N_GUARD,SBLOCK::S(B),XP(g)
    • S(b);N_GUARD::B(A),XR(d)
    • S(h);CHECK,SBLOCK::S(B)
  • Tries
    • Try
      • R(C);CHECK,N_SPINB(F),XB(j)
      • Refutation
        • Q(n);P_PINB(F),XR(C)
    • Try
      • R(H);CHECK,N_SPINB(F),XB(j)
      • Refutation
        • Q(n);P_PINB(F),P_SPINQ(n),XR(H)
    • Try
      • Q(E);CHECK
      • Vars
        • K(i);N_SPINB(j),S_FLIGHT::QAR2(E)
      • Refutation
        • K(i);N_SPINB(j),N_SPINR(d),P-FLIGHT,XB(F)
  • Actual
    • R(H);
    • Threat
      • QAR2(E),XS(h)
    • Vars
      • S(h);CHECK,SBLOCK::S(B)
      • S(h);CHECK,P_SPINS(h),XB(F)::QAR2(E)
      • S(h);CHECK,N_PINB(F)::R(H)+B(F)
      • K(i);N_SPINB(j),P_SPINS(h),S_FLIGHT::QAR2(E)
      • R(f);N_GUARD,SBLOCK::S(B),XP(g)
      • S(b);N_SPINR(d),SBLOCK::QAB(E)
      • S(b);N_GUARD::B(A),XR(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).