MESON Chess Problem Database
Problem Display
PID: 210348 (N1R1n3/P7/r1npp3/1p1kb2Q/1P1p1Pp1/3B1pN1/1P1K4/8 w - - 0 1)
Jakab, Arpad
The Observer, 1920
(First published on Sun Oct 24 1920)
#2
10 + 11
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Sb6#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Rxa7
- 2.Sb6#
- 1...Sxb4
- 2.Be4#
- 1...Sa5
- 2.Be4#
- 1...Sxa7
- 2.Be4#
- 1...Se7
- 2.Be4#
- 1...Sb8
- 2.Be4#
- 1...Sd8
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2
- 2.Qh1#
- 1...Ra1
- Tries
- 1.Kc1?
- 1...Rxa7
- 2.Sb6#
- 1...Sxb4
- 2.Be4#
- 1...Sxa7
- 2.Be4#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Sa5
- 2.Be4#
- 1...Se7
- 2.Be4#
- 1...Sb8
- 2.Be4#
- 1...Sd8
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2
- 2.Qh1#
- 1...Ra1+!
- 1...Rxa7
- 1.Kd1?
- 1...Rxa7
- 2.Sb6#
- 1...Sxb4
- 2.Be4#
- 1...Sxa7
- 2.Be4#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Sa5
- 2.Be4#
- 1...Se7
- 2.Be4#
- 1...Sb8
- 2.Be4#
- 1...Sd8
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2
- 2.Qh1#
- 1...Ra1+!
- 1...Rxa7
- 1.Kc2?
- 1...Rxa7
- 2.Sb6#
- 1...Sxa7
- 2.Be4#
- 1...Ra1
- 2.Sb6#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Sa5
- 2.Be4#
- 1...Se7
- 2.Be4#
- 1...Sb8
- 2.Be4#
- 1...Sd8
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2
- 2.Qh1#
- 1...Sxb4+!
- 1...Rxa7
- 1.Qxg4?
- threat
- 2.Qxf3#
- 1...Sf6
- 2.Sc7#
- 1...f2
- 2.Qf3#
- 1...Bxf4+!
- threat
- 1.Qg6?
- threat
- 2.Qe4#
- 1...Sf6
- 2.Sc7#
- 1...Bxf4+!
- threat
- 1.Qxe8?
- threat
- 2.Sc7#
- 1...Rxa7
- 2.Sb6#
- 2.Qxc6#
- 1...Sxb4
- 2.Be4#
- 2.Qxb5#
- 1...Bxf4+!
- threat
- 1.Qxe5+?
- 1...Sxe5
- 2.Be4#
- 1...dxe5!
- 1...Sxe5
- 1.Qf5?
- threat
- 2.Qe4#
- 1...Sf6
- 2.Sc7#
- 1...exf5!
- threat
- 1.Qg5?
- 1...Rxa7
- 2.Sb6#
- 1...Sxb4
- 2.Be4#
- 1...Sxa7
- 2.Be4#
- 1...Ra1
- 2.Sb6#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Sa5
- 2.Be4#
- 1...Se7
- 2.Be4#
- 1...Sb8
- 2.Be4#
- 1...Sd8
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2!
- 1...Rxa7
- 1.Qh7?
- threat
- 2.Qe4#
- 1...Sf6
- 2.Sc7#
- 1...Bxf4+!
- threat
- 1.b3?
- threat
- 2.Be4#
- 1...Sf6
- 2.Sc7#
- 1...Ra2+!
- threat
- 1.Kc1?
- Keys
- 1.Sf5!
- 1...Bxf4+
- 2.Se3#
- 1...Rxa7
- 2.Sb6#
- 1...Sxb4
- 2.Se7#
- 1...Sxa7
- 2.Se7#
- 1...exf5
- 2.Qf7#
- 1...Ra1
- 2.Sb6#
- 1...Ra2
- 2.Sb6#
- 1...Ra3
- 2.Sb6#
- 1...Ra4
- 2.Sb6#
- 1...Ra5
- 2.Sb6#
- 1...Rb6
- 2.Sxb6#
- 1...Bf6
- 2.Se3#
- 2.Se7#
- 1...Bg7
- 2.Se3#
- 2.Se7#
- 1...Bh8
- 2.Se3#
- 2.Se7#
- 1...Sa5
- 2.Se7#
- 1...Se7
- 2.Sxe7#
- 1...Sb8
- 2.Se7#
- 1...Sd8
- 2.Se7#
- 1...Sf6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...f2
- 2.Qh1#
- 1...g3
- 2.Qxf3#
- 1...Bxf4+
- 1.Sf5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- R(g);N_GUARD::S(I)
- R(g);N_GUARD,P_PINP(A)::S(I)
- R(g);N_GUARD::S(I),XR(g)
- R(g);N_GUARD,XP(H)::S(I)
- S(h);XP(E)::B(C)
- S(h);::B(C)
- S(h);XP(H)::B(C)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- P(a);OGATEB::QAB(G)
- Tries
- Try
- K(B);S_FLIGHT
- Vars
- R(g);N_GUARD,XP(H)::S(I)
- S(h);XP(E)::B(C)
- S(h);XP(H)::B(C)
- R(g);N_GUARD::S(I)
- R(g);N_GUARD::S(I),XR(g)
- S(h);::B(C)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- P(a);OGATEB::QAB(G)
- Refutation
- R(g);CHECK
- Try
- K(B);P-FLIGHT
- Vars
- R(g);N_GUARD,XP(H)::S(I)
- S(h);XP(E)::B(C)
- S(h);XP(H)::B(C)
- R(g);N_GUARD::S(I)
- R(g);N_GUARD::S(I),XR(g)
- S(h);::B(C)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- P(a);OGATEB::QAB(G)
- Refutation
- R(g);CHECK
- Try
- K(B);P-FLIGHT
- Vars
- R(g);N_GUARD,XP(H)::S(I)
- S(h);XP(H)::B(C)
- R(g);N_GUARD::S(I)
- R(g);N_GUARD,P_PINP(A)::S(I)
- R(g);N_GUARD::S(I),XR(g)
- S(h);::B(C)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- P(a);OGATEB::QAB(G)
- Refutation
- S(h);CHECK,XP(E)
- Try
- Q(G);N_PINB(f),XP(c)
- Threat
- QAB(G),XP(a)
- Vars
- S(k);N_GUARD::S(I)
- P(a);::QAB(G)
- Refutation
- B(f);CHECK,XP(F)
- Try
- Q(G);N_PINB(f)
- Threat
- QAB1(G)
- Vars
- S(k);N_GUARD::S(I)
- Refutation
- B(f);CHECK,XP(F)
- Try
- Q(G);N_PINB(f),XS(k)
- Threat
- S(I)
- Refutation
- B(f);CHECK,XP(F)
- Try
- Q(G);CHECK,XB(f)
- Vars
- S(h);XQ(G)::B(C)
- Refutation
- P(i);XQ(G)
- Try
- Q(G);
- Threat
- QAB1(G)
- Vars
- S(k);N_GUARD::S(I)
- Refutation
- P(j);N_SPINB(f),XQ(G)
- Try
- Q(G);
- Vars
- R(g);N_GUARD,XP(H)::S(I)
- S(h);XP(E)::B(C)
- S(h);XP(H)::B(C)
- R(g);N_GUARD::S(I)
- R(g);N_GUARD,P_PINP(A)::S(I)
- R(g);N_GUARD::S(I),XR(g)
- S(h);::B(C)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- Refutation
- P(a);
- Try
- Q(G);N_PINB(f)
- Threat
- QAB1(G)
- Vars
- S(k);N_GUARD::S(I)
- Refutation
- B(f);CHECK,XP(F)
- Try
- P(A);
- Threat
- B(C)
- Vars
- S(k);N_GUARD::S(I)
- Refutation
- R(g);CHECK
- Try
- Actual
- S(D);N_PINB(f)
- Vars
- B(f);CHECK,XP(F)::QAR(G)+S(D),DCHECK
- R(g);N_GUARD,XP(H)::S(I)
- S(h);N_GUARD,XP(E)::S(D)
- S(h);N_GUARD,XP(H)::S(D)
- P(j);OGATEB,XS(D)::QAB(G)
- R(g);N_GUARD::S(I)
- R(g);N_GUARD,P_PINP(A)::S(I)
- R(g);N_GUARD::S(I),XR(g)
- S(h);N_GUARD::S(D)
- S(h);N_GUARD::S(D),XS(h)
- S(k);N_GUARD::S(I)
- S(k);N_GUARD::S(I),XS(k)
- P(a);OGATEB::QAB(G)
- P(c);OGATE::QAB(G),XP(a)
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