MESON Chess Problem Database
Problem Display
PID: 190910 (1bqn4/1rp2p2/1k2bN1R/4RP2/Q2p4/3P4/1K6/8 w - - 0 1)
Andrade, Barry Jack da Costa
The Observer, 1938
(First published on Sun Sep 25 1938)
#2
7 + 9
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qd7
- 2.Sxd7#
- 1...Ra7
- 2.Qb5#
- 1...Ba2
- 2.Sd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd5
- 2.Sd7#
- 1...Bxf5
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- Tries
- 1.Ka1?
- 1...Bxf5
- 2.Sd7#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Ba2
- 2.Sd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...Ra7!
- 1...Bxf5
- 1.Kb1?
- 1...Bxf5
- 2.Sd7#
- 1...Ra7
- 2.Qb5#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...Ba2+!
- 1...Bxf5
- 1.Kc2?
- 1...Bxf5
- 2.Sd7#
- 1...Ra7
- 2.Qb5#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Ba2
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...Bb3+!
- 1...Bxf5
- 1.Ka3?
- 1...Bxf5
- 2.Sd7#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Ba2
- 2.Sd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...Ra7!
- 1...Bxf5
- 1.Ra5?
- threat
- 2.Sd5#
- 2.Qb5#
- 1...Ra7
- 2.Qb5#
- 1...c5
- 2.Sd5#
- 1...Qd7
- 2.Sxd7#
- 1...Bc4
- 2.Sd5#
- 2.Sd7#
- 1...Bd5
- 2.Sxd5#
- 2.Sd7#
- 2.Qb5#
- 1...Bd7
- 2.Sd5#
- 2.Sxd7#
- 1...Sc6
- 2.Rb5#
- 2.Qb5#
- 1...c6!
- threat
- 1.Rc5?
- threat
- 2.Qa5#
- 1...Ra7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 2.Rxc6#
- 1...Kxc5+!
- threat
- 1.Rd5?
- 1...Bxd5
- 2.Sd7#
- 1...Bxf5
- 2.Sd7#
- 1...Ra7
- 2.Qb5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...c5!
- 1...Bxd5
- 1.Rg6?
- 1...Bxf5
- 2.Sd7#
- 1...Ra7
- 2.Qb5#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Ba2
- 2.Sd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...fxg6!
- 1...Bxf5
- 1.Qb4+?
- 1...Ka6
- 2.Ra5#
- 1...Ka7
- 2.Ra5#
- 1...Kc6!
- 1...Ka6
- 1.Ka1?
- Keys
- 1.Kc1!
- 1...Bxf5
- 2.Sd7#
- 1...Ra7
- 2.Qb5#
- 1...Bd5
- 2.Sd7#
- 1...c5
- 2.Sd5#
- 1...c6
- 2.Qa5#
- 1...Qd7
- 2.Sxd7#
- 1...Ba2
- 2.Sd7#
- 1...Bb3
- 2.Sd7#
- 1...Bc4
- 2.Sd7#
- 1...Bd7
- 2.Sxd7#
- 1...Ba7
- 2.Qb5#
- 1...Sc6
- 2.Rb5#
- 1...Bxf5
- 1.Kc1!
FEATURES
- Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(h);N_GUARD::S(F),XQ(h)
- R(d);SBLOCK::QAR1(C)
- B(c);::R(G)+S(F),DCHECK
- B(c);XP(E)::R(G)+S(F),DCHECK
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Tries
- Try
- K(A);S_FLIGHT
- Vars
- B(c);XP(E)::R(G)+S(F),DCHECK
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- R(d);P_PINQ(C)
- Try
- K(A);P-FLIGHT
- Vars
- B(c);P_PINP(B),XP(E)::R(G)+S(F),DCHECK
- R(d);SBLOCK::QAR1(C)
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- B(c);CHECK
- Try
- K(A);P-FLIGHT
- Vars
- B(c);P_PINP(B),XP(E)::R(G)+S(F),DCHECK
- R(d);SBLOCK::QAR1(C)
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- B(c);CHECK
- Try
- K(A);S_FLIGHT
- Vars
- B(c);XP(E)::R(G)+S(F),DCHECK
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- R(d);P_PINQ(C)
- Try
- R(D);
- Threat
- DUALS(2)
- Vars
- R(d);::QAR1(C)
- P(e);::S(F)
- Q(h);N_GUARD::S(F),XQ(h)
- Refutation
- P(e);
- Try
- R(D);
- Threat
- QAB1(C)
- Vars
- R(d);SBLOCK::QAR1(C)
- Refutation
- K(b);CHECK,S_FLIGHT,XR(D)
- Try
- R(D);
- Vars
- B(c);XR(D)::R(G)+S(F),DCHECK
- B(c);XP(E)::R(G)+S(F),DCHECK
- R(d);SBLOCK::QAR1(C)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- P(e);
- Try
- R(G);
- Vars
- B(c);XP(E)::R(G)+S(F),DCHECK
- R(d);SBLOCK::QAR1(C)
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
- Refutation
- P(f);XR(G)
- Try
- Q(C);CHECK
- Vars
- K(b);P-FLIGHT,P_PINQ(C)::R1(D)
- K(b);P_PINQ(C),S_FLIGHT::R(D)
- Refutation
- K(b);P-FLIGHT,P_PINQ(C)
- Try
- Actual
- K(A);S_FLIGHT
- Vars
- B(c);XP(E)::R(G)+S(F),DCHECK
- R(d);SBLOCK::QAR1(C)
- B(c);::R(G)+S(F),DCHECK
- P(e);SBLOCK::S(F)
- P(e);SBLOCK::QAB1(C)
- Q(h);N_GUARD::S(F),XQ(h)
- B(c);::R(G)+S(F),DCHECK,XB(c)
- B(g);SBLOCK::QAR1(C)
- S(i);SBLOCK::R1(D)
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