MESON Chess Problem Database

Problem Display
PID: 206197 (3BBK2/4R3/7p/b3pp1N/Rq2n2k/p6P/5PP1/4QN2 w - - 0 1)

Ellerman, Arnoldo

Brisbane Courier, 1927

3BBK2/4R3/7p/b3pp1N/Rq2n2k/p6P/5PP1/4QN2

#2

11 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Rc7#
    • 1...Qc3
      • 2.Rc7#
    • 1...Qxe7+
      • 2.Bxe7#
    • 1...Qb1
      • 2.Rc7#
    • 1...Qb2
      • 2.Rc7#
    • 1...Qb3
      • 2.Rc7#
    • 1...Qb5
      • 2.Rc7#
    • 1...Qb7
      • 2.Rc7#
    • 1...Sd2
      • 2.f4#
    • 1...Sc3
      • 2.f4#
    • 1...Sc5
      • 2.Rc7#
    • 1...Sg5
      • 2.f3#
    • 1...Sd6
      • 2.Rc7#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Sf3#
      • 1...Qxe7+
        • 2.Bxe7#
      • 1...Kg5
        • 2.Sf3#
      • 1...Sxd2
        • 2.f4#
      • 1...Qc3
        • 2.Rc7#
      • 1...Qb3
        • 2.Rc7#
      • 1...Sg5
        • 2.f3#
        • 2.f4#
      • 1...Qxd2!
    • 1.f3+?
      • 1...Kg5
        • 2.h4#
      • 1...Qxe1
        • 2.Rc7#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sf2!
    • 1.f4+?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Qxe1!
  • Keys
    • 1.Sh2!
      • threat
        • 2.Sf3#
      • 1...Qxe7+
        • 2.Bxe7#
      • 1...Kg5
        • 2.Sf3#
      • 1...Qc3
        • 2.Rc7#
      • 1...Qb3
        • 2.Rc7#
      • 1...Sd2
        • 2.f4#
      • 1...Sg5
        • 2.f3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_PINR(H),P_SPINS(c),XQ(A)::B(I)+R(H)
    • Q(b);N_PINR(H),P_SPINS(c)::B(I)+R(H)
    • Q(b);CHECK,OGATE,P_SPINQ(b),P_SPINS(c),XR(H)::B(I),XQ(b)
    • S(c);N_GUARD,P_SPINQ(b)::QAB(A)+P(C)
    • S(c);N_PINR(H),P_SPINQ(b)::B(I)+R(H)
    • S(c);N_GUARD,P_SPINQ(b),SBLOCK::QAB(A)+P(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),P_SPINS(c),XR(H)::B(I),XQ(b)
        • K(d);S_FLIGHT::S(B)
        • S(c);N_GUARD,P_SPINQ(b),XS(B)::QAB(A)+P(C)
        • Q(b);N_PINR(H),P_SPINS(c)::B(I)+R(H)
      • Refutation
        • Q(b);N_PINR(H),P_SPINS(c),XS(B)
    • Try
      • P(C);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::P(E)
        • Q(b);N_PINR(H),P_SPINS(c),XQ(A)::B(I)+R(H)
        • S(c);N_GUARD,P_SPINQ(b),P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • S(c);P_SPINQ(b),P_SPINS(c)
    • Try
      • P(C);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB(A),XS(c)
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • Q(b);N_PINR(H),XQ(A)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),P_SPINS(c),XR(H)::B(I),XQ(b)
      • K(d);S_FLIGHT::S(B)
      • Q(b);N_PINR(H),P_SPINS(c)::B(I)+R(H)
      • S(c);N_GUARD,P_SPINQ(b)::QAB(A)+P(C)
      • S(c);N_GUARD,P_SPINQ(b),SBLOCK::QAB(A)+P(C)
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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).