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Problem Display

PID: 16512 (4r3/3p4/1p3p2/4n2Q/1P1k1p1N/1KNpn3/8/2b1r3 w - - 0 1)

Fisher, HF

Chess, 1941

4r3/3p4/1p3p2/4n2Q/1P1k1p1N/1KNpn3/8/2b1r3

#2

5 + 11

SOLUTION

SOUND
Sets
- 1...Sd1
  - 2.Sf5#
- 1...Sf1
  - 2.Sf5#
- 1...Sc2
  - 2.Sf5#
- 1...Sg2
  - 2.Sf5#
- 1...S3c4
  - 2.Sf5#
- 1...S3g4
  - 2.Sf5#
- 1...Sd5
  - 2.Sf5#
- 1...Sf5
  - 2.Sxf5#
- 1...Sf3
  - 2.Sxf3#
- 1...S5c4
  - 2.Sf3#
- 1...S5g4
  - 2.Sf3#
- 1...Sc6
  - 2.Sf3#
- 1...Sg6
  - 2.Sf3#
- 1...Sf7
  - 2.Sf3#
Tries
- 1.Qxe5+?
  - 1...Rxe5
    - 2.Sf3#
  - 1...fxe5
    - 2.Sf3#
  - 1...Kxe5!
- 1.Qh7?
  - threat
    - 2.Qe4#
  - 1...Sd1
    - 2.Sf5#
  - 1...Sf1
    - 2.Sf5#
  - 1...Sc2
    - 2.Sf5#
  - 1...Sg2
    - 2.Sf5#
  - 1...S3c4
    - 2.Sf5#
  - 1...S3g4
    - 2.Sf5#
  - 1...Sd5
    - 2.Sf5#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sf3
    - 2.Sxf3#
  - 1...S5c4
    - 2.Sf3#
  - 1...S5g4
    - 2.Sf3#
  - 1...Sc6
    - 2.Sf3#
  - 1...Sg6
    - 2.Sf3#
  - 1...Sf7
    - 2.Sf3#
  - 1...d5
    - 2.Sb5#
  - 1...f5!
Keys
- 1.Qg6!
  - threat
    - 2.Qe4#
  - 1...Sxg6
    - 2.Sf3#
  - 1...Sd1
    - 2.Sf5#
  - 1...Sf1
    - 2.Sf5#
  - 1...Sc2
    - 2.Sf5#
  - 1...Sg2
    - 2.Sf5#
  - 1...S3c4
    - 2.Sf5#
  - 1...S3g4
    - 2.Sf5#
  - 1...Sd5
    - 2.Sf5#
  - 1...Sf5
    - 2.Sxf5#
  - 1...Sf3
    - 2.Sxf3#
  - 1...S5c4
    - 2.Sf3#
  - 1...S5g4
    - 2.Sf3#
  - 1...Sc6
    - 2.Sf3#
  - 1...Sf7
    - 2.Sf3#
  - 1...f5
    - 2.Qxb6#
  - 1...d5
    - 2.Sb5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- S(d);N_GUARD::S(D)
- S(d);N_GUARD::S(D),XS(d)
- S(g);N_GUARD::S(D),XS(g)
- S(g);N_GUARD::S(D)
Tries
- Try
  - Q(E);CHECK,XS(g)
  - Vars
    - R(k);XQ(E)::S(D)
    - P(i);XQ(E)::S(D)
  - Refutation
    - K(e);S_FLIGHT,XQ(E)
- Try
  - Q(E);
  - Threat
    - QAR1(E)
  - Vars
    - S(d);N_GUARD::S(D)
    - S(d);N_GUARD::S(D),XS(d)
    - S(g);N_GUARD::S(D),XS(g)
    - S(g);N_GUARD::S(D)
    - P(j);SBLOCK::S(B)
  - Refutation
    - P(i);
Actual
- Q(E);
- Threat
  - QAR1(E)
- Vars
  - S(g);N_GUARD,XQ(E)::S(D)
  - S(d);N_GUARD::S(D)
  - S(d);N_GUARD::S(D),XS(d)
  - S(g);N_GUARD::S(D),XS(g)
  - S(g);N_GUARD::S(D)
  - P(i);OGATE::QAB(E),XP(h)
  - P(j);SBLOCK::S(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).