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Problem Display

PID: 206468 (8/4B3/3P4/2N1k1p1/2prp1Rb/4N1nK/B6Q/8 w - - 0 1)

Kovacs, Florian Janos

Ujsag, 1925

8/4B3/3P4/2N1k1p1/2prp1Rb/4N1nK/B6Q/8

#2

8 + 7

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Rd1
  - 2.Rxe4#
- 1...Rd2
  - 2.Rxe4#
- 1...Rd3
  - 2.Rxe4#
- 1...Rd5
  - 2.Rxe4#
- 1...Rxd6
  - 2.Rxe4#
- 1...c3
  - 2.Sd7#
Tries
- 1.Kg2?
  - 1...Rxd6
    - 2.Rxe4#
  - 1...Rd1
    - 2.Rxe4#
  - 1...Rd3
    - 2.Rxe4#
  - 1...Rd5
    - 2.Rxe4#
  - 1...c3
    - 2.Sd7#
  - 1...Rd2+!
- 1.Bb1?
  - 1...Rxd6
    - 2.Rxe4#
  - 1...Rd1
    - 2.Rxe4#
  - 1...Rd2
    - 2.Rxe4#
  - 1...Rd3
    - 2.Rxe4#
  - 1...Rd5
    - 2.Rxe4#
  - 1...c3!
- 1.Bb3?
  - 1...Rxd6
    - 2.Rxe4#
  - 1...Rd1
    - 2.Rxe4#
  - 1...Rd2
    - 2.Rxe4#
  - 1...Rd3
    - 2.Rxe4#
  - 1...Rd5
    - 2.Rxe4#
  - 1...c3
    - 2.Sd7#
  - 1...cxb3!
- 1.Bxc4?
  - threat
    - 2.Sd7#
  - 1...Rxd6
    - 2.Rxe4#
  - 1...Rd1
    - 2.Rxe4#
  - 1...Rd2
    - 2.Rxe4#
  - 1...Rd3
    - 2.Rxe4#
  - 1...Rd5
    - 2.Rxe4#
  - 1...Rxc4!
- 1.Rxg5+?
  - 1...Kf4
    - 2.Qf2#
  - 1...Bxg5!
- 1.Qf2?
  - threat
    - 2.Qf6#
  - 1...Sf5
    - 2.Qxf5#
  - 1...Sh5
    - 2.Qf5#
  - 1...Rxd6!
- 1.d7?
  - 1...Rxd7
    - 2.Rxe4#
  - 1...Rd1
    - 2.Rxe4#
  - 1...Rd2
    - 2.Rxe4#
  - 1...Rd3
    - 2.Rxe4#
  - 1...Rd5
    - 2.Rxe4#
  - 1...Rd6
    - 2.Rxe4#
  - 1...c3!
Keys
- 1.Qb2!
  - 1...Sf1
    - 2.Rxe4#
  - 1...Sh1
    - 2.Rxe4#
  - 1...Se2
    - 2.Rxe4#
  - 1...Sf5
    - 2.Rxe4#
  - 1...Sh5
    - 2.Rxe4#
  - 1...c3
    - 2.Sd7#

FEATURES

Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 5
Sets
- R(c);N_GUARD::R1(E),XP(d)
- R(c);N_GUARD,XP(G)::R1(E),XP(d)
- P(b);::S(F)
Tries
- Try
  - K(D);S_FLIGHT
  - Vars
    - R(c);N_GUARD,XP(G)::R1(E),XP(d)
    - R(c);N_GUARD::R1(E),XP(d)
    - P(b);::S(F)
  - Refutation
    - R(c);CHECK
- Try
  - B(A);
  - Vars
    - R(c);N_GUARD,XP(G)::R1(E),XP(d)
    - R(c);N_GUARD::R1(E),XP(d)
  - Refutation
    - P(b);
- Try
  - B(A);
  - Vars
    - R(c);N_GUARD,XP(G)::R1(E),XP(d)
    - R(c);N_GUARD::R1(E),XP(d)
    - P(b);::S(F)
  - Refutation
    - P(b);XB(A)
- Try
  - B(A);XP(b)
  - Threat
    - S(F)
  - Vars
    - R(c);N_GUARD,XP(G)::R1(E),XP(d)
    - R(c);N_GUARD::R1(E),XP(d)
  - Refutation
    - R(c);XB(A)
- Try
  - R(E);CHECK,XP(g)
  - Vars
    - K(f);S_FLIGHT::QAR2(B)
  - Refutation
    - B(e);XR(E)
- Try
  - Q(B);N_PINS(a)
  - Threat
    - QAB1(B)
  - Vars
    - S(a);N_GUARD::QAR1(B),XS(a)
    - S(a);N_GUARD::QAR1(B)
  - Refutation
    - R(c);XP(G)
- Try
  - P(G);
  - Vars
    - R(c);N_GUARD,XP(G)::R1(E),XP(d)
    - R(c);N_GUARD::R1(E),XP(d)
  - Refutation
    - P(b);
Actual
- Q(B);N_PINS(a),P_PINR(c)
- Vars
  - S(a);N_GUARD::R1(E),XP(d)
  - P(b);N_SPINR(c)::S(F)

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).