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Problem Display

PID: 27210 (4N2K/5B1p/5P1k/6N1/7P/8/4Q3/3q4 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

4N2K/5B1p/5P1k/6N1/7P/8/4Q3/3q4

#2

7 + 3

5454	Near Snap	2008

SOLUTION

SOUND
Sets
- 1...Qc2
  - 2.Qh5#
- 1...Qb3
  - 2.Qh5#
- 1...Qa4
  - 2.Qh5#
- 1...Qa1
  - 2.Qh5#
- 1...Qb1
  - 2.Qh5#
- 1...Qc1
  - 2.Qh5#
- 1...Qe1
  - 2.Qh5#
- 1...Qf1
  - 2.Qh5#
- 1...Qg1
  - 2.Qh5#
- 1...Qh1
  - 2.Qh5#
- 1...Qd2
  - 2.Qh5#
- 1...Qd3
  - 2.Qh5#
- 1...Qd4
  - 2.Qh5#
- 1...Qd5
  - 2.Qh5#
- 1...Qd6
  - 2.Qh5#
- 1...Qd7
  - 2.Qh5#
- 1...Qd8
  - 2.Qh5#
Tries
- 1.Kg8?
  - 1...Qc2
    - 2.Qh5#
  - 1...Qb3
    - 2.Qh5#
  - 1...Qa4
    - 2.Qh5#
  - 1...Qa1
    - 2.Qh5#
  - 1...Qb1
    - 2.Qh5#
  - 1...Qc1
    - 2.Qh5#
  - 1...Qe1
    - 2.Qh5#
  - 1...Qf1
    - 2.Qh5#
  - 1...Qg1
    - 2.Qh5#
  - 1...Qh1
    - 2.Qh5#
  - 1...Qd2
    - 2.Qh5#
  - 1...Qd3
    - 2.Qh5#
  - 1...Qd4
    - 2.Qh5#
  - 1...Qd5
    - 2.Qh5#
  - 1...Qd6
    - 2.Qh5#
  - 1...Qd7
    - 2.Qh5#
  - 1...Qd8
    - 2.Qh5#
  - 1...Qxe2!
- 1.Sg7?
  - threat
    - 2.Sf5#
  - 1...Qd5
    - 2.Qh5#
  - 1...Qc2
    - 2.Qh5#
  - 1...Qb1
    - 2.Qh5#
  - 1...Qf1
    - 2.Qh5#
  - 1...Qd3
    - 2.Qh5#
  - 1...Qd7
    - 2.Qh5#
  - 1...Qd8+!
Keys
- 1.Sd6!
  - threat
    - 2.Sf5#
  - 1...Qxd6
    - 2.Qh5#
  - 1...Qd5
    - 2.Qh5#
  - 1...Qc2
    - 2.Qh5#
  - 1...Qb1
    - 2.Qh5#
  - 1...Qf1
    - 2.Qh5#
  - 1...Qd3
    - 2.Qh5#

Anticipated by 27209(1992)

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 11
Sets
- Q(a);N_GUARD::QAR1(A)
- Q(a);N_GUARD,P_PINP(D)::QAR1(A)
- Q(a);N_GUARD,P_PINS(F)::QAR1(A)
Tries
- Try
  - K(G);P-FLIGHT
  - Vars
    - Q(a);N_GUARD::QAR1(A)
    - Q(a);N_GUARD,P_PINB(E)::QAR1(A)
    - Q(a);N_GUARD,P_PINS(C)::QAR1(A)
    - Q(a);N_GUARD,P_PINS(F)::QAR1(A)
  - Refutation
    - Q(a);XQ(A)
- Try
  - S(F);
  - Threat
    - S(F)
  - Vars
    - Q(a);N_GUARD::QAR1(A)
  - Refutation
    - Q(a);CHECK
Actual
- S(F);
- Threat
  - S(F)
- Vars
  - Q(a);N_GUARD,XS(F)::QAR1(A)
  - Q(a);N_GUARD::QAR1(A)

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).