MESON Chess Problem Database

Problem Display
PID: 250090 (2B5/1K6/8/3NkNP1/3Rqr2/p7/8/B1b1Q3 w - - 0 1)

Ellerman, Arnoldo

Chemnitzer Tageblatt, 1927

2B5/1K6/8/3NkNP1/3Rqr2/p7/8/B1b1Q3

#2

8 + 5

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Qxe4#
    • 1...Rf2
      • 2.Qxe4#
    • 1...Rf3
      • 2.Qxe4#
    • 1...Bd2
      • 2.Rxd2#
  • Tries
    • 1.Ra4+?
      • 1...Kxd5
        • 2.Qa5#
      • 1...Bb2!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qc7#
      • 1...Qb1+
        • 2.Sb4#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxd4
        • 2.Sf6#
      • 1...Qc2
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(d);N_GUARD::QAR1(B),XQ(c)
    • B(a);N_GUARD::B(A)+R(C),XB(a)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(e);N_SPINQ(c),P-FLIGHT,S_CUTB(a),S_CUTQ(c),XS(D)::QAR(B)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • Q(B);N_PINQ(c)
    • Threat
      • QAB(B)
    • Vars
      • Q(c);CHECK,N_PINS(D)::QAR(B)+S(D)
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::QAR1(B),XQ(c)
      • Q(c);N_PINS(D),P_SPINQ(c),XR(C)::QAR(B)+S(D)
      • Q(c);N_PINS(D)::QAR(B)+S(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).