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Problem Display

PID: 176408 (3N4/B5q1/3PR3/1N1k4/8/1KpP4/8/8 w - - 0 1)

Cheylan, Yves

Schach-Echo, 1977

3N4/B5q1/3PR3/1N1k4/8/1KpP4/8/8

#2

7 + 3

6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...Qd4
  - 2.Sc7#
- 1...Qe5
  - 2.Sc7#
- 1...Qf6
  - 2.Sc7#
- 1...Qh6
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qf8
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qh8
  - 2.Sc7#
- 1...Qg1
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qg2
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qg3
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qg4
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qg5
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qg6
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qc7
  - 2.Sxc7#
- 1...Qd7
  - 2.Sxc3#
- 1...Qe7
  - 2.Sxc3#
- 1...Qf7
  - 2.Sxc3#
- 1...Qh7
  - 2.Sxc3#
- 1...Qg8
  - 2.Sxc3#
  - 2.Sc7#
Tries
- 1.Bb6?
  - 1...Qb7
    - 2.Sxc3#
  - 1...Qd4
    - 2.Sc7#
  - 1...Qe5
    - 2.Sc7#
  - 1...Qf6
    - 2.Sc7#
  - 1...Qh6
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qf8
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qh8
    - 2.Sc7#
  - 1...Qg1
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qg2
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qg3
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qg4
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qg5
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qg6
    - 2.Sxc3#
    - 2.Sc7#
  - 1...Qa7
    - 2.Sxc3#
  - 1...Qc7
    - 2.Sxc7#
  - 1...Qd7
    - 2.Sxc3#
  - 1...Qe7
    - 2.Sxc3#
  - 1...Qf7
    - 2.Sxc3#
  - 1...Qh7
    - 2.Sxc3#
  - 1...Qg8
    - 2.Sxc3#
    - 2.Sc7#
  - 1...c2!
- 1.d7?
  - threat
    - 2.Sc7#
  - 1...Qxd7
    - 2.Sxc3#
  - 1...Qg3
    - 2.Sxc3#
  - 1...Qe5!
Keys
- 1.d4!
  - threat
    - 2.Sxc3#
  - 1...Qxd4
    - 2.Sc7#
  - 1...Qxa7
    - 2.Re5#
  - 1...Qb7
    - 2.Re5#
  - 1...Qg3
    - 2.Sc7#
  - 1...Qc7
    - 2.Sxc7#
    - 2.Re5#
  - 1...c2
    - 2.Sc3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 8
Sets
- Q(c);N_GUARD::S(C)
- Q(c);N_GUARD::S(C),XQ(c)
- Q(c);N_GUARD::S(C),XP(a)
Tries
- Try
  - B(F);
  - Vars
    - Q(c);N_GUARD::S(C),XP(a)
    - Q(c);N_GUARD::S(C)
    - Q(c);N_GUARD::S(C),XQ(c)
  - Refutation
    - P(a);
- Try
  - P(D);
  - Threat
    - S(C)
  - Vars
    - Q(c);N_GUARD,XP(D)::S(C),XP(a)
    - Q(c);N_GUARD::S(C),XP(a)
  - Refutation
    - Q(c);
Actual
- P(B);
- Threat
  - S(C),XP(a)
- Vars
  - Q(c);N_GUARD,XP(B)::S(C)
  - Q(c);N_GUARD,XB(F)::R1(E)
  - Q(c);N_GUARD,P_PINS(C)::R1(E)
  - Q(c);N_GUARD::S(C)
  - P(a);::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).