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Problem Display

PID: 220464 (BKQ1q3/PP6/3B4/1N1kpN2/8/8/4R3/1n6 w - - 0 1)

Ellerman, Arnoldo

British Chess Magazine, 1925

BKQ1q3/PP6/3B4/1N1kpN2/8/8/4R3/1n6

#2

9 + 4

SOLUTION

SOUND
Sets
- 1...Qxb5
  - 2.Rxe5#
- 1...Qh5
  - 2.Se7#
  - 2.Rxe5#
- 1...Qc6
  - 2.Qg8#
- 1...Qg6
  - 2.Se7#
  - 2.Rxe5#
- 1...Qd7
  - 2.Rxe5#
- 1...Qf7
  - 2.Rxe5#
- 1...Qe6
  - 2.Qc5#
- 1...Qe7
  - 2.Sxe7#
- 1...Qxc8+
  - 2.bxc8Q#
- 1...Qd8
  - 2.Rxe5#
- 1...Qf8
  - 2.Rxe5#
- 1...Qg8
  - 2.Se7#
  - 2.Rxe5#
- 1...Qh8
  - 2.Se7#
- 1...Sd2
  - 2.Sc3#
- 1...Sa3
  - 2.Sc3#
- 1...Sc3
  - 2.Sxc3#
- 1...e4
  - 2.Se3#
Tries
- 1.Rd2+?
  - 1...Sxd2
    - 2.Sc3#
  - 1...Ke4!
- 1.Re3?
  - 1...Qxc8+
    - 2.bxc8Q#
  - 1...Qxb5
    - 2.Rxe5#
  - 1...Qc6
    - 2.Qg8#
  - 1...Qd7
    - 2.Rxe5#
  - 1...Qh8
    - 2.Se7#
  - 1...Qh5
    - 2.Se7#
    - 2.Rxe5#
  - 1...Qg6
    - 2.Se7#
    - 2.Rxe5#
  - 1...Qf7
    - 2.Rxe5#
  - 1...Qe6
    - 2.Qc5#
  - 1...Qe7
    - 2.Sxe7#
  - 1...Qd8
    - 2.Rxe5#
  - 1...Qf8
    - 2.Rxe5#
  - 1...Qg8
    - 2.Se7#
    - 2.Rxe5#
  - 1...Sd2
    - 2.Sc3#
  - 1...Sa3
    - 2.Sc3#
  - 1...Sc3
    - 2.Sxc3#
  - 1...e4!
Keys
- 1.Re1!
  - 1...Qxc8+
    - 2.bxc8Q#
  - 1...Qxb5
    - 2.Rxe5#
  - 1...Qc6
    - 2.Qg8#
  - 1...Qd7
    - 2.Rxe5#
  - 1...Qh8
    - 2.Se7#
  - 1...Qh5
    - 2.Se7#
    - 2.Rxe5#
  - 1...Qg6
    - 2.Se7#
    - 2.Rxe5#
  - 1...Qf7
    - 2.Rxe5#
  - 1...Qe6
    - 2.Qc5#
  - 1...Qe7
    - 2.Sxe7#
  - 1...Qd8
    - 2.Rxe5#
  - 1...Qf8
    - 2.Rxe5#
  - 1...Qg8
    - 2.Se7#
    - 2.Rxe5#
  - 1...Sd2
    - 2.Sc3#
  - 1...Sa3
    - 2.Sc3#
  - 1...Sc3
    - 2.Sxc3#
  - 1...e4
    - 2.Se3#

FEATURES

Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- Q(d);N_GUARD,N_PINQ(I),P_PINP(F),XS(B)::R1(A),XP(c)
- Q(d);N_PINQ(I),SBLOCK::QAB(I)
- Q(d);N_GUARD,N_PINQ(I)::R1(A),XP(c)
- Q(d);N_PINQ(I),SBLOCK::QAR1(I)
- Q(d);N_GUARD,N_PINQ(I)::S(C),XQ(d)
- Q(d);CHECK,OGATE,XQ(I)::PXQ(d)=Q
- Q(d);N_GUARD::R1(A),XP(c)
- Q(d);N_GUARD::S(C)
- S(a);N_GUARD::S(B)
- S(a);N_GUARD::S(B),XS(a)
- P(c);SBLOCK::S(C)
Tries
- Try
  - R(A);CHECK
  - Vars
    - S(a);XR(A)::S(B)
  - Refutation
    - K(b);S_FLIGHT
- Try
  - R(A);
  - Vars
    - Q(d);CHECK,OGATE,XQ(I)::PXQ(d)=Q
    - Q(d);N_GUARD,N_PINQ(I),P_PINP(F),XS(B)::R1(A),XP(c)
    - Q(d);N_PINQ(I),SBLOCK::QAB(I)
    - Q(d);N_GUARD,N_PINQ(I)::R1(A),XP(c)
    - Q(d);N_GUARD::S(C)
    - Q(d);N_PINQ(I),SBLOCK::QAR1(I)
    - Q(d);N_GUARD,N_PINQ(I)::S(C),XQ(d)
    - Q(d);N_GUARD::R1(A),XP(c)
    - S(a);N_GUARD::S(B)
    - S(a);N_GUARD::S(B),XS(a)
  - Refutation
    - P(c);
Actual
- R(A);
- Vars
  - Q(d);CHECK,OGATE,XQ(I)::PXQ(d)=Q
  - Q(d);N_GUARD,N_PINQ(I),P_PINP(F),XS(B)::R1(A),XP(c)
  - Q(d);N_PINQ(I),SBLOCK::QAB(I)
  - Q(d);N_GUARD,N_PINQ(I)::R1(A),XP(c)
  - Q(d);N_GUARD::S(C)
  - Q(d);N_PINQ(I),SBLOCK::QAR1(I)
  - Q(d);N_GUARD,N_PINQ(I)::S(C),XQ(d)
  - Q(d);N_GUARD::R1(A),XP(c)
  - S(a);N_GUARD::S(B)
  - S(a);N_GUARD::S(B),XS(a)
  - P(c);SBLOCK::S(C)

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).