MESON Chess Problem Database
Problem Display
PID: 164368 (4B3/bp6/1r3B2/1RN2n2/N1k1p3/5P1K/r1pQ4/2R5 w - - 0 1)
Alvey, George Clarence Vincent
The Observer, 1926
(First published on Sun Jul 18 1926)
#2
9 + 8
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Sb2#
- 2.Rxc2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Bf7#
- 1...Ra6
- 2.Rb4#
- 1...Rc6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Rxf6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...exf3
- 2.Qd3#
- 1...e3
- 2.Qd3#
- 1...Ra1
- Tries
- 1.Kh2?
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Bf7#
- 1...Rxf6
- 2.Rb4#
- 1...exf3
- 2.Qd3#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...Ra1
- 2.Sb2#
- 2.Rxc2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...Bb8+!
- 1...Rxa4
- 1.Sb3?
- threat
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rxa4
- 2.Rxc2#
- 2.Qc3#
- 2.Qxc2#
- 2.Qe2#
- 2.Qd5#
- 1...exf3
- 2.Sa5#
- 2.Qc3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qe2#
- 2.Qd5#
- 1...Ra6
- 2.Rb4#
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rd6
- 2.Sa5#
- 2.Rb4#
- 2.Qc3#
- 1...Se3
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Sa5#
- 2.Qc3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Sa5#
- 2.Qc3#
- 2.Qxd4#
- 1...Se7
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Rxb5!
- threat
- 1.Sxe4?
- threat
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rxf6
- 2.Rb4#
- 2.Qc3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qe2#
- 2.Qd5#
- 1...Ra3
- 2.Sb2#
- 2.Qd5#
- 1...Rd6
- 2.Rb4#
- 2.Qc3#
- 1...Se3
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Qc3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Qc3#
- 2.Qxd4#
- 1...Se7
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Rxb5!
- threat
- 1.Sa6?
- threat
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rxf6
- 2.Rb4#
- 2.Qc3#
- 2.Qd5#
- 1...exf3
- 2.Qc3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qe2#
- 2.Qd5#
- 1...Ra3
- 2.Sb2#
- 2.Qd5#
- 1...Rd6
- 2.Rb4#
- 2.Qc3#
- 1...Se3
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Qc3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Qc3#
- 2.Qxd4#
- 1...Se7
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Rxb5!
- threat
- 1.Se6?
- threat
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...exf3
- 2.Qc3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qe2#
- 2.Qd5#
- 1...Ra3
- 2.Sb2#
- 2.Qd5#
- 1...Rd6
- 2.Rb4#
- 2.Qc3#
- 1...Se3
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Qc3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Qc3#
- 2.Qxd4#
- 1...Se7
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Rxb5!
- threat
- 1.Sxb7?
- threat
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rxa4
- 2.Rxc2#
- 2.Qc3#
- 2.Qxc2#
- 2.Qe2#
- 2.Qd5#
- 1...Rxf6
- 2.Sa5#
- 2.Rb4#
- 2.Qc3#
- 2.Qd5#
- 1...Rxb7
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...exf3
- 2.Sa5#
- 2.Qc3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qe2#
- 2.Qd5#
- 1...Ra3
- 2.Sb2#
- 2.Sa5#
- 2.Qd5#
- 1...Ra6
- 2.Rb4#
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Rd6
- 2.Sa5#
- 2.Rb4#
- 2.Qc3#
- 1...Se3
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Sa5#
- 2.Qc3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Sa5#
- 2.Qc3#
- 2.Qxd4#
- 1...Se7
- 2.Sa5#
- 2.Qc3#
- 2.Qe2#
- 2.Qd4#
- 1...Rxb5!
- threat
- 1.Ba1?
- 1...Rxa1
- 2.Sb2#
- 2.Rxc2#
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Bf7#
- 1...exf3
- 2.Qd3#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Rf6
- 2.Rb4#
- 1...Rg6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...Rh6+!
- 1...Rxa1
- 1.Be5?
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Bf7#
- 1...exf3
- 2.Qd3#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...Ra1
- 2.Sb2#
- 2.Rxc2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Rf6
- 2.Rb4#
- 1...Rg6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...Rh6+!
- 1...Rxa4
- 1.Bc6?
- threat
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd5#
- 1...Rxa4
- 2.Rxc2#
- 2.Qc3#
- 2.Qxc2#
- 2.Qe2#
- 2.Qd5#
- 1...Rxb5
- 2.Bd5#
- 2.Qc3#
- 1...Rxc6
- 2.Rb4#
- 1...exf3
- 2.Qc3#
- 2.Qb4#
- 2.Qd3#
- 2.Qd5#
- 1...Rb2
- 2.Sxb2#
- 2.Qc3#
- 2.Qe2#
- 2.Qd5#
- 1...Ra3
- 2.Sb2#
- 2.Qb4#
- 2.Qd5#
- 1...Se3
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd4#
- 1...Sg3
- 2.Qc3#
- 2.Qb4#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Qc3#
- 2.Qb4#
- 2.Qxd4#
- 1...Se7
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd4#
- 1...bxc6!
- threat
- 1.Bf7+?
- 1...Re6
- 2.Rb4#
- 1...Kxb5!
- 1...Re6
- 1.Ra1?
- 1...Rxa1
- 2.Sb2#
- 1...Rxa4
- 2.Rxa4#
- 1...Rxb5
- 2.Bf7#
- 1...Rxf6
- 2.Rb4#
- 1...exf3
- 2.Qd3#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...c1Q
- 2.Qxa2#
- 1...c1B
- 2.Qxa2#
- 1...c1R
- 2.Qxa2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...c1S!
- 1...Rxa1
- 1.Rxb6?
- threat
- 2.Bb5#
- 2.Bf7#
- 2.Rb4#
- 1...Rxa4
- 2.Rxc2#
- 1...Sd4
- 2.Qxd4#
- 1...Rb2
- 2.Bf7#
- 1...Se3
- 2.Bb5#
- 2.Rb4#
- 2.Qd4#
- 1...Sd6
- 2.Rb4#
- 2.Qd4#
- 1...Sh6
- 2.Bb5#
- 2.Rb4#
- 2.Qd4#
- 1...Se7
- 2.Bb5#
- 2.Rb4#
- 2.Qd4#
- 1...Sg7
- 2.Bb5#
- 2.Rb4#
- 2.Qd4#
- 1...Bxb6!
- threat
- 1.fxe4?
- threat
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd3#
- 2.Qd5#
- 1...Rxa4
- 2.Rxc2#
- 2.Qc3#
- 2.Qxc2#
- 2.Qe2#
- 2.Qd3#
- 2.Qd5#
- 1...Rxb5
- 2.Bf7#
- 2.Qc3#
- 1...Rxf6
- 2.Rb4#
- 2.Qc3#
- 2.Qb4#
- 2.Qd3#
- 2.Qd5#
- 1...Rc6
- 2.Rb4#
- 2.Qb4#
- 2.Qe2#
- 2.Qd3#
- 1...Rb2
- 2.Sxb2#
- 2.Qc3#
- 2.Qe2#
- 2.Qd3#
- 2.Qd5#
- 1...Rd6
- 2.Rb4#
- 2.Qc3#
- 2.Qb4#
- 1...Se3
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd3#
- 2.Qd4#
- 1...Sg3
- 2.Qc3#
- 2.Qb4#
- 2.Qd3#
- 2.Qd4#
- 2.Qd5#
- 1...Sd4
- 2.Qc3#
- 2.Qb4#
- 2.Qd3#
- 2.Qxd4#
- 1...Se7
- 2.Qc3#
- 2.Qb4#
- 2.Qe2#
- 2.Qd3#
- 2.Qd4#
- 1...Ra3+!
- threat
- 1.f4?
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Bf7#
- 1...Rxf6
- 2.Rb4#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...Ra1
- 2.Sb2#
- 2.Rxc2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...Ra3+!
- 1...Rxa4
- 1.Kh2?
- Keys
- 1.Bd7!
- 1...Rxa4
- 2.Rxc2#
- 1...Rxb5
- 2.Be6#
- 1...Rxf6
- 2.Rb4#
- 1...exf3
- 2.Qd3#
- 1...Rc6
- 2.Rb4#
- 1...Sd4
- 2.Qxd4#
- 1...Ra1
- 2.Sb2#
- 2.Rxc2#
- 1...Rb2
- 2.Sxb2#
- 1...Ra3
- 2.Sb2#
- 1...Ra6
- 2.Rb4#
- 1...Rd6
- 2.Rb4#
- 1...Re6
- 2.Rb4#
- 1...Bb8
- 2.Sxb6#
- 1...Se3
- 2.Qd4#
- 1...Sg3
- 2.Qd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Sh6
- 2.Qd4#
- 1...Se7
- 2.Qd4#
- 1...Sg7
- 2.Qd4#
- 1...e3
- 2.Qd3#
- 1...Rxa4
- 1.Bd7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD,P_PINP(C)::S(E)
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- R(f);N_GUARD::R1(F)
- R(f);N_GUARD,XB(H)::R1(F)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- S(e);N_GUARD::QAR1(B),XS(e)
- P(d);N_GUARD,XP(C)::QAB1(B)
- P(d);N_GUARD::QAB1(B)
- Tries
- Try
- K(D);P-FLIGHT
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- R(f);N_GUARD,XB(H)::R1(F)
- P(d);N_GUARD,XP(C)::QAB1(B)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD::S(E)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
- Refutation
- B(g);CHECK
- Try
- S(G);
- Threat
- DUALS(4)
- Refutation
- R(f);XR(F)
- Try
- S(G);XP(d)
- Threat
- DUALS(3)
- Refutation
- R(f);XR(F)
- Try
- S(G);
- Threat
- DUALS(3)
- Refutation
- R(f);XR(F)
- Try
- S(G);
- Threat
- DUALS(3)
- Refutation
- R(f);XR(F)
- Try
- S(G);XP(h)
- Threat
- DUALS(4)
- Refutation
- R(f);XR(F)
- Try
- B(H);
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- P(d);N_GUARD,XP(C)::QAB1(B)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD,P_PINP(C)::S(E)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
- Refutation
- R(f);CHECK
- Try
- B(H);
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- P(d);N_GUARD,XP(C)::QAB1(B)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD,P_PINP(C)::S(E)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
- Refutation
- R(f);CHECK
- Try
- B(I);
- Threat
- DUALS(4)
- Vars
- R(f);N_GUARD,XB(I)::R1(F)
- Refutation
- P(h);XB(I)
- Try
- B(I);CHECK
- Vars
- R(f);P_SPINR(f)::R1(F)
- Refutation
- K(c);N_SPINP(b),S_FLIGHT,XR(F)
- Try
- R(A);N_PINP(b)
- Vars
- R(a);N_GUARD,XR(A)::S(E)
- R(a);OGATE,XS(E)::R(A),XR(a)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- R(f);N_GUARD,XB(H)::R1(F)
- P(d);N_GUARD,XP(C)::QAB1(B)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- P(b);OGATE::QAB(B),XR(a)
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD,P_PINP(C)::S(E)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
- Refutation
- P(b);
- Try
- R(F);XR(f)
- Threat
- DUALS(3)
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);::B(I)
- Refutation
- B(g);XR(F)
- Try
- P(C);XP(d)
- Threat
- DUALS(5)
- Refutation
- R(a);CHECK
- Try
- P(C);
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- R(f);N_GUARD,XB(H)::R1(F)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);N_GUARD::S(E),XR(a)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
- Refutation
- R(a);CHECK
- Try
- Actual
- B(I);
- Vars
- R(a);N_GUARD,XS(E)::R(A),XP(b)
- R(f);N_GUARD,SBLOCK,XR(F)::B(I)
- R(f);N_GUARD,XB(H)::R1(F)
- P(d);N_GUARD,XP(C)::QAB1(B)
- R(f);N_GUARD::R1(F)
- S(e);N_GUARD::QAR1(B),XS(e)
- R(a);N_GUARD::S(E),XR(a)
- R(a);N_GUARD,P_PINP(C)::S(E)
- B(g);N_GUARD::S(E),XR(f)
- S(e);N_GUARD::QAR1(B)
- P(d);N_GUARD::QAB1(B)
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).