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Problem Display

PID: 27333 (K7/Rpp5/pr5Q/kb3R2/P7/2P5/8/3B4 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

K7/Rpp5/pr5Q/kb3R2/P7/2P5/8/3B4

#2

7 + 6

SOLUTION

SOUND
Sets
- 1...Rc6
  - 2.Rxb5#
- 1...Rd6
  - 2.Rxb5#
- 1...Re6
  - 2.Rxb5#
- 1...Rf6
  - 2.Rxb5#
- 1...Rg6
  - 2.Rxb5#
- 1...Rxh6
  - 2.Rxb5#
Tries
- 1.Rc5?
  - 1...Rxh6
    - 2.Rxb5#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...c6!
- 1.Qf4?
  - threat
    - 2.Qb4#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...Rh6
    - 2.Rxb5#
  - 1...c5!
- 1.Qf8?
  - threat
    - 2.Qb4#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...Rh6
    - 2.Rxb5#
  - 1...c5!
- 1.Qh4?
  - threat
    - 2.Qb4#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...Rh6
    - 2.Rxb5#
  - 1...c5!
- 1.Qxb6+?
  - 1...cxb6
    - 2.Rxb5#
  - 1...Kxb6!
- 1.Qc6?
  - 1...Rxc6
    - 2.Rxb5#
  - 1...bxc6!
- 1.c4?
  - threat
    - 2.Qd2#
  - 1...Rxh6
    - 2.Rxb5#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...Kb4!
Keys
- 1.Qd2!
  - threat
    - 2.c4#
  - 1...Rc6
    - 2.Rxb5#
  - 1...Rd6
    - 2.Rxb5#
  - 1...Re6
    - 2.Rxb5#
  - 1...Rf6
    - 2.Rxb5#
  - 1...Rg6
    - 2.Rxb5#
  - 1...Rh6
    - 2.Rxb5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- R(d);N_GUARD::R1(D),XB(b)
- R(d);N_GUARD,XQ(E)::R1(D),XB(b)
Tries
- Try
  - R(D);
  - Vars
    - R(d);N_GUARD,XQ(E)::R1(D),XB(b)
    - R(d);N_GUARD::R1(D),XB(b)
  - Refutation
    - P(f);
- Try
  - Q(E);
  - Threat
    - QAB1(E)
  - Vars
    - R(d);N_GUARD::R1(D),XB(b)
  - Refutation
    - P(f);N_SPINB(b)
- Try
  - Q(E);
  - Threat
    - QAB1(E)
  - Vars
    - R(d);N_GUARD::R1(D),XB(b)
  - Refutation
    - P(f);N_SPINB(b)
- Try
  - Q(E);
  - Threat
    - QAB1(E)
  - Vars
    - R(d);N_GUARD::R1(D),XB(b)
  - Refutation
    - P(f);N_SPINB(b)
- Try
  - Q(E);CHECK,XR(d)
  - Vars
    - P(f);XQ(E)::R1(D),XB(b)
  - Refutation
    - K(a);N_SPINB(b),N_SPINP(c),S_FLIGHT,XQ(E)
- Try
  - Q(E);
  - Vars
    - R(d);N_GUARD,XQ(E)::R1(D),XB(b)
  - Refutation
    - P(e);XQ(E)
- Try
  - P(B);
  - Threat
    - QAB(E)
  - Vars
    - R(d);N_GUARD,XQ(E)::R1(D),XB(b)
    - R(d);N_GUARD::R1(D),XB(b)
  - Refutation
    - K(a);N_SPINB(b),N_SPINP(c),S_FLIGHT
Actual
- Q(E);
- Threat
  - QAB(E)+P(B)
- Vars
  - R(d);N_GUARD::R1(D),XB(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).