MESON Chess Problem Database
Problem Display
PID: 186901 (3b4/1Qpp3B/N1nP1R2/r2k2p1/5P2/B1P2p2/1N1p1K2/n6R w - - 0 1)
de Castro, B
The Observer, 1933
(First published on Sun Jun 18 1933)
#2
11 + 10
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rxa3
- 2.Qb5#
- 1...Ra4
- 2.Qb5#
- 1...Rb5
- 2.Qxb5#
- 1...Rc5
- 2.Sb4#
- 1...Rxa6
- 2.Qb5#
- 1...Bxf6
- 2.Sxc7#
- 1...Be7
- 2.Sxc7#
- 1...Sc2
- 2.Qb3#
- 1...Sb3
- 2.Qxb3#
- 1...d1Q
- 2.Rxd1#
- 1...d1S+
- 2.Rxd1#
- 1...d1B
- 2.Rxd1#
- 1...d1R
- 2.Rxd1#
- 1...gxf4
- 2.Rh5#
- 1...g4
- 2.Rh5#
- 1...cxd6
- 2.Rxd6#
- 1...Rxa3
- Tries
- 1.Kxf3?
- threat
- 2.Be4#
- 2.Bg8#
- 1...d1Q+
- 2.Rxd1#
- 1...d1B+
- 2.Rxd1#
- 1...Bxf6
- 2.Sxc7#
- 2.Bg8#
- 1...gxf4
- 2.Rh5#
- 1...Ra4
- 2.Bg8#
- 2.Qb5#
- 1...g4+!
- threat
- 1.Bb1?
- 1...d1S+
- 2.Rxd1#
- 1...Rxa3
- 2.Qb5#
- 1...Rxa6
- 2.Qb5#
- 1...Bxf6
- 2.Sxc7#
- 1...gxf4
- 2.Rh5#
- 1...cxd6
- 2.Rxd6#
- 1...d1Q
- 2.Rxd1#
- 1...d1B
- 2.Rxd1#
- 1...d1R
- 2.Rxd1#
- 1...Rc5
- 2.Sb4#
- 1...Ra4
- 2.Qb5#
- 1...Rb5
- 2.Qxb5#
- 1...Be7
- 2.Sxc7#
- 1...Sb3
- 2.Qxb3#
- 1...g4
- 2.Rh5#
- 1...Sc2!
- 1...d1S+
- 1.Bc2?
- 1...d1S+
- 2.Rxd1#
- 1...Rxa3
- 2.Qb5#
- 1...Rxa6
- 2.Qb5#
- 1...Bxf6
- 2.Sxc7#
- 1...gxf4
- 2.Rh5#
- 1...cxd6
- 2.Rxd6#
- 1...d1Q
- 2.Rxd1#
- 1...d1B
- 2.Rxd1#
- 1...d1R
- 2.Rxd1#
- 1...Rc5
- 2.Sb4#
- 1...Ra4
- 2.Qb5#
- 1...Rb5
- 2.Qxb5#
- 1...Be7
- 2.Sxc7#
- 1...Sb3
- 2.Qxb3#
- 1...g4
- 2.Rh5#
- 1...Sxc2!
- 1...d1S+
- 1.Rxa1?
- threat
- 2.Qb3#
- 1...d1S+
- 2.Rxd1#
- 1...Rxa3
- 2.Qb5#
- 1...d1Q
- 2.Rxd1#
- 1...d1B
- 2.Rxd1#
- 1...Rc5
- 2.Sb4#
- 1...Ra4
- 2.Qb5#
- 1...Rb5
- 2.Qxb5#
- 1...gxf4!
- threat
- 1.Rd1?
- threat
- 2.Rxd2#
- 1...Bxf6
- 2.Sxc7#
- 1...Ra4
- 2.Qb5#
- 1...Sc2
- 2.Qb3#
- 1...Sb3
- 2.Qxb3#
- 1...gxf4!
- threat
- 1.Rg1?
- threat
- 2.Rxg5#
- 1...d1S+
- 2.Rxd1#
- 1...Bxf6
- 2.Sxc7#
- 1...gxf4
- 2.Rg5#
- 1...g4!
- threat
- 1.Rh5?
- threat
- 2.Rxg5#
- 1...Bxf6
- 2.Sxc7#
- 1...d1S+!
- threat
- 1.Kxf3?
- Keys
- 1.Bg6!
- 1...d1S+
- 2.Rxd1#
- 1...Rxa3
- 2.Qb5#
- 1...Rxa6
- 2.Qb5#
- 1...Bxf6
- 2.Sxc7#
- 1...gxf4
- 2.Rh5#
- 1...cxd6
- 2.Rxd6#
- 1...d1Q
- 2.Rxd1#
- 1...d1B
- 2.Rxd1#
- 1...d1R
- 2.Rxd1#
- 1...Rc5
- 2.Sb4#
- 1...Ra4
- 2.Qb5#
- 1...Rb5
- 2.Qxb5#
- 1...Be7
- 2.Sxc7#
- 1...Sc2
- 2.Qb3#
- 1...Sb3
- 2.Qxb3#
- 1...g4
- 2.Rh5#
- 1...d1S+
- 1.Bg6!
FEATURES
- Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(d);N_GUARD,XB(D)::QAR2(J)
- R(d);N_GUARD::QAR2(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- R(d);SBLOCK::S(G)
- R(d);N_GUARD,XS(G)::QAR2(J)
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- B(j);N_GUARD::S(G),XP(h)
- S(a);N_GUARD::QAB(J)
- S(a);N_GUARD::QAB(J),XS(a)
- P(b);OGATEB::R(A),XQ(b)
- P(b);CHECK,OGATEB::R(A),XS(b)
- P(b);OGATEB::R(A),XB(b)
- P(b);OGATEB::R(A),XR(b)
- P(f);OGATEB,XP(F)::R(A)
- P(f);OGATEB::R(A)
- P(h);OGATE,XP(H)::R1(I),XP(h)
- Tries
- Try
- K(C);P-FLIGHT,XP(c)
- Threat
- DUALS(2)
- Vars
- P(b);CHECK,OGATEB::R(A),XQ(b)
- P(b);CHECK,OGATEB::R(A),XB(b)
- P(f);OGATEB,XP(F)::R(A)
- Refutation
- P(f);CHECK
- Try
- B(K);
- Vars
- P(b);CHECK,OGATEB::R(A),XS(b)
- R(d);N_GUARD,XB(D)::QAR2(J)
- R(d);N_GUARD,XS(G)::QAR2(J)
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- P(f);OGATEB,XP(F)::R(A)
- P(h);OGATE,XP(H)::R1(I),XP(h)
- P(b);OGATEB::R(A),XQ(b)
- P(b);OGATEB::R(A),XB(b)
- P(b);OGATEB::R(A),XR(b)
- R(d);SBLOCK::S(G)
- R(d);N_GUARD::QAR2(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- B(j);N_GUARD::S(G),XP(h)
- S(a);N_GUARD::QAB(J),XS(a)
- P(f);OGATEB::R(A)
- Refutation
- S(a);
- Try
- B(K);
- Vars
- P(b);CHECK,OGATEB::R(A),XS(b)
- R(d);N_GUARD,XB(D)::QAR2(J)
- R(d);N_GUARD,XS(G)::QAR2(J)
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- P(f);OGATEB,XP(F)::R(A)
- P(h);OGATE,XP(H)::R1(I),XP(h)
- P(b);OGATEB::R(A),XQ(b)
- P(b);OGATEB::R(A),XB(b)
- P(b);OGATEB::R(A),XR(b)
- R(d);SBLOCK::S(G)
- R(d);N_GUARD::QAR2(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- B(j);N_GUARD::S(G),XP(h)
- S(a);N_GUARD::QAB(J),XS(a)
- P(f);OGATEB::R(A)
- Refutation
- S(a);XB(K)
- Try
- R(A);XS(a)
- Threat
- QAB(J)
- Vars
- P(b);CHECK,OGATEB::R(A),XS(b)
- R(d);N_GUARD,XB(D)::QAR2(J)
- P(b);OGATEB::R(A),XQ(b)
- P(b);OGATEB::R(A),XB(b)
- R(d);SBLOCK::S(G)
- R(d);N_GUARD::QAR2(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- Refutation
- P(f);XP(F)
- Try
- R(A);P_PINP(b)
- Threat
- R(A),XP(b)
- Vars
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- R(d);N_GUARD::QAR2(J)
- S(a);N_GUARD::QAB(J)
- S(a);N_GUARD::QAB(J),XS(a)
- Refutation
- P(f);XP(F)
- Try
- R(A);
- Threat
- R(A),XP(f)
- Vars
- P(b);CHECK,OGATEB::R(A),XS(b)
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- P(f);XP(F)::R(A)
- Refutation
- P(f);
- Try
- R(A);P_PINP(f)
- Threat
- R(A),XP(f)
- Vars
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- Refutation
- P(b);CHECK
- Try
- Actual
- B(K);
- Vars
- P(b);CHECK,OGATEB::R(A),XS(b)
- R(d);N_GUARD,XB(D)::QAR2(J)
- R(d);N_GUARD,XS(G)::QAR2(J)
- B(j);N_GUARD,XR(I)::S(G),XP(h)
- P(f);OGATEB,XP(F)::R(A)
- P(h);OGATE,XP(H)::R1(I),XP(h)
- P(b);OGATEB::R(A),XQ(b)
- P(b);OGATEB::R(A),XB(b)
- P(b);OGATEB::R(A),XR(b)
- R(d);SBLOCK::S(G)
- R(d);N_GUARD::QAR2(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- B(j);N_GUARD::S(G),XP(h)
- S(a);N_GUARD::QAB(J)
- S(a);N_GUARD::QAB(J),XS(a)
- P(f);OGATEB::R(A)
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