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Problem Display

PID: 59935 (8/5p2/8/1QB2K2/8/5pp1/3R1N2/r3kNr1 w - - 0 1)

van der Ven, AMA

2nd Highly Comm., Brisbane Courier, 1925

8/5p2/8/1QB2K2/8/5pp1/3R1N2/r3kNr1

#2

6 + 6

SOLUTION

SOUND
Sets
- 1...Rb1
  - 2.Qxb1#
- 1...Rd1
  - 2.Rxd1#
- 1...Ra2
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra3
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra4
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra5
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra6
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra7
  - 2.Rd1#
  - 2.Qb1#
- 1...Ra8
  - 2.Rd1#
  - 2.Qb1#
- 1...gxf2
  - 2.Bxf2#
Tries
- 1.Rd5?
  - threat
    - 2.Re5#
  - 1...Rxf1
    - 2.Qe8#
  - 1...gxf2
    - 2.Bb4#
  - 1...Ra2
    - 2.Rd1#
  - 1...Ra3
    - 2.Rd1#
  - 1...Ra4
    - 2.Rd1#
  - 1...f6!
- 1.Rd7?
  - threat
    - 2.Re7#
  - 1...gxf2
    - 2.Bb4#
  - 1...Ra2
    - 2.Rd1#
  - 1...Ra3
    - 2.Rd1#
  - 1...Ra4
    - 2.Rd1#
  - 1...Ra6
    - 2.Rd1#
  - 1...Ra7
    - 2.Rd1#
  - 1...Rxf1!
- 1.Qb2?
  - threat
    - 2.Qxa1#
  - 1...Rxf1
    - 2.Sd3#
  - 1...Rc1
    - 2.Qxc1#
  - 1...Rb1
    - 2.Qxb1#
  - 1...Rd1
    - 2.Rxd1#
  - 1...Ra2
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra3
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra4
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra5
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra6
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra7
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Ra8
    - 2.Rd1#
    - 2.Qc1#
    - 2.Qb1#
  - 1...Kxf1!
Keys
- 1.Rd8!
  - threat
    - 2.Re8#
  - 1...Rxf1
    - 2.Qe8#
  - 1...gxf2
    - 2.Bb4#
  - 1...Ra2
    - 2.Rd1#
  - 1...Ra3
    - 2.Rd1#
  - 1...Ra4
    - 2.Rd1#
  - 1...Ra6
    - 2.Rd1#
  - 1...Ra7
    - 2.Rd1#
  - 1...Ra8
    - 2.Rd1#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 7
- REMOVED MATES = 2
Sets
- R(a);N_GUARD::QAR(D),XR(a)
- R(a);N_GUARD::R1(B),XR(a)
- P(e);OGATE,XS(C)::B(E),XP(e)
Tries
- Try
  - R(B);
  - Threat
    - R(B)
  - Vars
    - R(c);SBLOCK,XS(A)::QAB(D)
    - P(e);SBLOCK,XS(C)::B(E)
    - R(a);N_GUARD::R1(B)
  - Refutation
    - P(f);
- Try
  - R(B);
  - Threat
    - R(B)
  - Vars
    - P(e);SBLOCK,XS(C)::B(E)
    - R(a);N_GUARD::R1(B)
  - Refutation
    - R(c);XS(A)
- Try
  - Q(D);
  - Threat
    - QAR(D),XR(a)
  - Vars
    - R(c);SBLOCK,XS(A)::S(C)
    - R(a);N_GUARD::QAR2(D),XR(a)
    - R(a);N_GUARD::QAR(D),XR(a)
    - R(a);N_GUARD::R1(B),XR(a)
  - Refutation
    - K(b);P-FLIGHT,XS(A)
Actual
- R(B);
- Threat
  - R(B)
- Vars
  - R(c);SBLOCK,XS(A)::QAB(D)
  - P(e);SBLOCK,XS(C)::B(E)
  - R(a);N_GUARD::R1(B)

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).