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Problem Display

PID: 184461 (8/K4B2/8/R7/NkNp4/6r1/Q7/8 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1928

(First published on Sun Sep 2 1928)

8/K4B2/8/R7/NkNp4/6r1/Q7/8

#2

6 + 3

15239	Valois Notebooks	2018

SOLUTION

SOUND
Sets
- 1...Rg1
  - 2.Qb2#
  - 2.Qa3#
- 1...Rg2
  - 2.Qa3#
- 1...Ra3
  - 2.Qxa3#
- 1...Rg4
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
- 1...Rg5
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
- 1...Rg6
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
- 1...Rg7
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
- 1...Rg8
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
- 1...d3
  - 2.Qb1#
  - 2.Qb2#
  - 2.Qa3#
Tries
- 1.Ka6?
  - threat
    - 2.Rb5#
  - 1...Ra3
    - 2.Qxa3#
  - 1...Rg5
    - 2.Qb1#
    - 2.Qb2#
    - 2.Qa3#
  - 1...Rg6+!
- 1.Kb6?
  - threat
    - 2.Rb5#
  - 1...Ra3
    - 2.Qxa3#
  - 1...Rg5
    - 2.Qb1#
    - 2.Qb2#
    - 2.Qa3#
  - 1...Rg6+!
- 1.Sc3?
  - threat
    - 2.Sd5#
    - 2.Qb2#
    - 2.Qa3#
  - 1...Rxc3
    - 2.Qa4#
  - 1...dxc3
    - 2.Qb1#
    - 2.Qa3#
    - 2.Qa4#
  - 1...Rg2
    - 2.Sd5#
    - 2.Qa3#
  - 1...Rg5
    - 2.Qb2#
    - 2.Qa3#
  - 1...Kxc3!
- 1.Ra6?
  - threat
    - 2.Rb6#
  - 1...Kb5
    - 2.Rb6#
  - 1...Rg5
    - 2.Qb1#
    - 2.Qb2#
  - 1...Rg6
    - 2.Qb1#
    - 2.Qb2#
  - 1...Ra3!
- 1.Qd2+?
  - 1...Kb3
    - 2.Sc5#
    - 2.Qb2#
  - 1...Rc3!
Keys
- 1.Qh2!
  - 1...Kb3
    - 2.Qb2#
  - 1...Rb3
    - 2.Qd6#
    - 2.Qb8#
  - 1...Rg1
    - 2.Qb8#
    - 2.Qb2#
  - 1...Rg2
    - 2.Qb8#
  - 1...Ra3
    - 2.Qb8#
  - 1...Rc3
    - 2.Qb8#
  - 1...Rd3
    - 2.Qb8#
  - 1...Re3
    - 2.Qb8#
  - 1...Rf3
    - 2.Qb8#
  - 1...Rh3
    - 2.Qb8#
  - 1...Rg4
    - 2.Qb8#
    - 2.Qb2#
  - 1...Rg5
    - 2.Qb2#
  - 1...Rg6
    - 2.Qb2#
  - 1...Rg7
    - 2.Qb8#
    - 2.Qb2#
  - 1...Rg8
    - 2.Qb2#
  - 1...d3
    - 2.Qb2#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 2
- ADDED MATES = 10
- REMOVED MATES = 0
Sets
- R(a);N_GUARD::QAB1(A)
- R(a);N_GUARD::QAB1(A),XR(a)
Tries
- Try
  - K(E);P-FLIGHT
  - Threat
    - R1(D)
  - Vars
    - R(a);N_GUARD::QAB1(A),XR(a)
  - Refutation
    - R(a);CHECK
- Try
  - K(E);S_FLIGHT
  - Threat
    - R1(D)
  - Vars
    - R(a);N_GUARD::QAB1(A),XR(a)
  - Refutation
    - R(a);CHECK
- Try
  - S(B);
  - Threat
    - DUALS(3)
  - Vars
    - R(a);SBLOCK,XS(B)::QAR1(A)
  - Refutation
    - K(b);S_FLIGHT,XS(B)
- Try
  - R(D);
  - Threat
    - R(D)
  - Vars
    - K(b);P-FLIGHT::R1(D)
  - Refutation
    - R(a);
- Try
  - Q(A);CHECK
  - Refutation
    - R(a);P_SPINR(a)
Actual
- Q(A);
- Vars
  - K(b);P-FLIGHT::QAR1(A)
  - R(a);OGATE::QAR(A)
  - R(a);N_GUARD::QAR2(A)
  - P(c);S_CUTR(a)::QAR2(A)

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