MESON Chess Problem Database
Problem Display
PID: 269980 (R1r4q/P2p4/Bn4r1/1np5/kBN1N3/P6R/1Q3p2/K3b3 w - - 0 1)
Leaver, Rev DC
The Observer, 1958
(First published on Sun Sep 14 1958)
#2
10 + 10
| 17397 | Ling Notebooks | 2023 |
SOLUTION
- SOUND
- Sets
- 1...Qxb2+
- 2.Sxb2#
- 1...Qh4
- 2.Qc2#
- 2.Qb3#
- 1...Qh5
- 2.Qc2#
- 2.Qb3#
- 1...Qh6
- 2.Qc2#
- 2.Qb3#
- 1...Qh7
- 2.Qc2#
- 2.Qb3#
- 1...Qd8
- 2.Qc2#
- 2.Qb3#
- 1...Qe8
- 2.Qc2#
- 2.Qb3#
- 1...Qf8
- 2.Qc2#
- 2.Qb3#
- 1...Qg8
- 2.Qc2#
- 2.Qb3#
- 1...Rg1
- 2.Sxb6#
- 1...Rg2
- 2.Sxb6#
- 1...Rg3
- 2.Sxb6#
- 1...Rg4
- 2.Sxb6#
- 1...Rg5
- 2.Sxb6#
- 1...Rf6
- 2.Qc2#
- 2.Qb3#
- 1...Rg7
- 2.Sxb6#
- 2.Qc2#
- 2.Qb3#
- 1...Rgg8
- 2.Sxb6#
- 1...Rxa8
- 2.Sxc5#
- 1...Rb8
- 2.Sxc5#
- 1...Rd8
- 2.Sxc5#
- 1...Re8
- 2.Sxc5#
- 1...Rf8
- 2.Sxc5#
- 1...Rcg8
- 2.Sxc5#
- 1...Sxa3
- 2.Rxa3#
- 1...Sc3
- 2.Qc2#
- 1...Sd6
- 2.Sxb6#
- 1...Sc7
- 2.Sxc5#
- 1...d6
- 2.Sxb6#
- 1...Qxb2+
- Tries
- 1.Sed6?
- threat
- 2.Sxb6#
- 2.Bxb5#
- 1...Qxb2+
- 2.Sxb2#
- 1...Bxb4
- 2.Bxb5#
- 1...Sxa3
- 2.Sxb6#
- 2.Rxa3#
- 1...Sxd6
- 2.Sxb6#
- 1...Sxa7
- 2.Sxb6#
- 2.Bb5#
- 1...Sxc4
- 2.Bxb5#
- 1...Sxa8
- 2.Bxb5#
- 1...cxb4
- 2.Bxb5#
- 1...Qd8
- 2.Bxb5#
- 2.Qc2#
- 2.Qb3#
- 1...Rc6
- 2.Bxb5#
- 1...Rb8
- 2.Bxb5#
- 1...Sc3
- 2.Sxb6#
- 2.Qc2#
- 1...Sd4
- 2.Sxb6#
- 1...Sc7
- 2.Sxb6#
- 1...Sd5
- 2.Bxb5#
- 1...Rxd6!
- threat
- 1.Sf6?
- threat
- 2.Sxb6#
- 2.Qc2#
- 2.Qb3#
- 1...Qxh3
- 2.Sxb6#
- 1...Rxf6
- 2.Qc2#
- 2.Qb3#
- 1...Bxb4
- 2.Qc2#
- 2.Qb3#
- 1...Sxa3
- 2.Sxb6#
- 2.Rxa3#
- 2.Qxa3#
- 2.Qb3#
- 1...Sxc4
- 2.Qc2#
- 2.Qb3#
- 1...Sxa8
- 2.Qc2#
- 2.Qb3#
- 1...cxb4
- 2.Qb3#
- 1...Qd8
- 2.Qc2#
- 2.Qb3#
- 1...Rg3
- 2.Sxb6#
- 1...Rc6
- 2.Qc2#
- 2.Qb3#
- 1...Rb8
- 2.Qc2#
- 2.Qb3#
- 1...Bc3
- 2.Sxb6#
- 1...Sc3
- 2.Sxb6#
- 2.Qc2#
- 1...Sd4
- 2.Sxb6#
- 1...Sd5
- 2.Qc2#
- 2.Qb3#
- 1...Qxf6!
- threat
- 1.Bc3?
- threat
- 2.Bxb5#
- 2.Qc2#
- 2.Qxb5#
- 1...Qxc3
- 2.Bxb5#
- 1...Bxc3
- 2.Bxb5#
- 1...Sxa3
- 2.Qxa3#
- 1...Sxc3
- 2.Qc2#
- 1...Sxa7
- 2.Bb5#
- 2.Qc2#
- 1...Sxc4
- 2.Bxb5#
- 1...Sd6
- 2.Sxb6#
- 2.Qc2#
- 1...Sc7
- 2.Sxc5#
- 2.Qc2#
- 1...Sd4!
- threat
- 1.Sed6?
- Keys
- 1.Bd2!
- threat
- 2.Bxb5#
- 1...Qxb2+
- 2.Sxb2#
- 1...Sxa3
- 2.Rxa3#
- 1...Sxa7
- 2.Bb5#
- 1...Sc3
- 2.Qc2#
- 1...Sd4
- 2.Sc3#
- 1...Sd6
- 2.Sxb6#
- 1...Sc7
- 2.Sxc5#
- threat
- 1.Bd2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 13
- Sets
- Q(j);CHECK,XQ(B)::S(F),XQ(j)
- R(g);N_GUARD::S(F),XS(f)
- R(i);N_GUARD,XR(J)::S(G),XP(e)
- R(i);N_GUARD::S(G),XP(e)
- S(d);OGATE,XP(C)::R1(D),XS(d)
- S(d);N_PINQ(B)::QAB(B)
- S(d);S_CUTR(g)::S(F),XS(f)
- S(d);S_CUTR(i)::S(G),XP(e)
- P(h);S_CUTR(g)::S(F),XS(f)
- Tries
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(j);CHECK,XQ(B)::S(F),XQ(j)
- B(a);XB(E)::B(H),XS(d)
- S(d);XS(G)::S(F),XS(f)
- S(f);XS(F)::B(H),XS(d)
- S(f);XR(J)::B(H),XS(d)
- P(e);XB(E)::B(H),XS(d)
- R(i);::B(H),XS(d)
- S(d);N_PINQ(B)::S(F),XS(f)
- S(d);::S(F),XS(f)
- S(f);::B(H),XS(d)
- Refutation
- R(g);XS(G)
- Try
- S(G);N_SPINQ(B)
- Threat
- DUALS(3)
- Vars
- Q(j);SBLOCK,XR(D)::S(F),XS(f)
- P(e);XB(E)::QAB1(B)
- R(g);::S(F),XS(f)
- B(a);P_PINQ(B)::S(F),XS(f)
- S(d);::S(F),XS(f)
- Refutation
- Q(j);P_PINQ(B),XS(G)
- Try
- B(E);N_SPINQ(B)
- Threat
- DUALS(3)
- Vars
- Q(j);P_PINQ(B),XB(E)::B(H),XS(d)
- B(a);P_PINQ(B),XB(E)::B(H),XS(d)
- S(d);OGATE,XP(C)::QAR1(B),XS(d)
- S(d);XB(E)::QAB(B)
- S(f);XS(F)::B(H),XS(d)
- Refutation
- S(d);
- Try
- Actual
- B(E);
- Threat
- B(H),XS(d)
- Vars
- Q(j);CHECK,XQ(B)::S(F),XQ(j)
- S(d);OGATE,XP(C)::R1(D),XS(d)
- S(d);XP(I)::B(H)
- S(d);N_PINQ(B)::QAB(B)
- S(d);N_GUARD,N_PINQ(B),S_CUTQ(j)::S(G)
- S(d);S_CUTR(g)::S(F),XS(f)
- S(d);S_CUTR(i)::S(G),XP(e)
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