MESON Chess Problem Database
Problem Display
PID: 204317 (5N2/2P2P1r/q1n2p2/R3bk1p/1rB2N1K/6P1/b3RBP1/5Q2 w - - 0 1)
Ellerman, Arnoldo
L'Alfiere di Re, 1925
#2
12 + 9
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qb5
- 2.c8Q#
- 2.c8B#
- 1...Qxa5
- 2.c8Q#
- 2.c8B#
- 1...Qb6
- 2.c8Q#
- 2.c8B#
- 1...Rb3
- 2.Be6#
- 1...Rb5
- 2.Bd3#
- 1...Bb1
- 2.Be6#
- 1...Qb5
- Tries
- 1.Sh3?
- threat
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Ba7#
- 1...Qxc4+
- 2.Bd4#
- 1...Rxc4+
- 2.Bd4#
- 1...Qxa5
- 2.c8Q#
- 2.c8B#
- 1...Qb5
- 2.c8Q#
- 2.c8B#
- 1...Qb6
- 2.Bd4#
- 2.Bxb6#
- 2.c8Q#
- 2.c8B#
- 1...Qa7
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- 1...Rb1
- 2.Be1#
- 1...Rb3
- 2.Be6#
- 1...Rb5
- 2.Bd3#
- 1...Rb6
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bxb6#
- 1...Sd4
- 2.Bxd4#
- 1...Sa7
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- 1...Sxa5!
- threat
- 1.Sxh5?
- threat
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Ba7#
- 2.g4#
- 1...Qxc4+
- 2.Bd4#
- 1...Rxc4+
- 2.Bd4#
- 1...Qxa5
- 2.g4#
- 2.c8Q#
- 2.c8B#
- 1...Sxa5
- 2.g4#
- 1...Qb5
- 2.g4#
- 2.c8Q#
- 2.c8B#
- 1...Qb6
- 2.Bd4#
- 2.Bxb6#
- 2.g4#
- 2.c8Q#
- 2.c8B#
- 1...Qa7
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- 2.g4#
- 1...Rb1
- 2.Be1#
- 2.g4#
- 1...Rb3
- 2.Be6#
- 2.g4#
- 1...Rb5
- 2.Bd3#
- 2.g4#
- 1...Rb6
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bxb6#
- 2.g4#
- 1...Rg7
- 2.Sxg7#
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Ba7#
- 1...Sd4
- 2.Bxd4#
- 2.g4#
- 1...Sa7
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- 2.g4#
- 1...Rxh5+!
- threat
- 1.Bd3+?
- 1...Re4
- 2.Bxe4#
- 1...Qxd3!
- 1...Re4
- 1.Rexe5+?
- 1...Sxe5
- 2.Qd3#
- 1...fxe5!
- 1...Sxe5
- 1.Qb1+?
- 1...Bxb1
- 2.Be6#
- 1...Rxb1!
- 1...Bxb1
- 1.g4+?
- 1...Kxf4
- 2.Se6#
- 2.Sg6#
- 2.Be1#
- 2.Bg1#
- 2.Bg3#
- 2.Bd4#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- 2.Qc1#
- 1...hxg4+!
- 1...Kxf4
- 1.Sh3?
- Keys
- 1.S4g6!
- threat
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Ba7#
- 1...Qxc4+
- 2.Bd4#
- 1...Rxc4+
- 2.Bd4#
- 1...Qxa5
- 2.c8Q#
- 2.c8B#
- 1...Sxa5
- 2.Se7#
- 1...Qb5
- 2.c8Q#
- 2.c8B#
- 1...Qb6
- 2.Bd4#
- 2.Bxb6#
- 2.c8Q#
- 2.c8B#
- 1...Qa7
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- 1...Rb1
- 2.Be1#
- 1...Rb3
- 2.Be6#
- 1...Rb5
- 2.Bd3#
- 1...Rb6
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bxb6#
- 1...Sd4
- 2.Se7#
- 2.Bxd4#
- 1...Sa7
- 2.Se7#
- 2.Be1#
- 2.Bg1#
- 2.Bd4#
- 2.Bb6#
- 2.Bxa7#
- threat
- 1.S4g6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 1
- Sets
- Q(f);N_GUARD,N_SPINB(c)::P=Q
- Q(f);N_GUARD,N_SPINB(c),XR(I)::P=Q
- Q(f);N_GUARD::P=Q
- R(b);S_CUTB(a)::B(F)
- R(b);N_GUARD,N_SPINB(c),S_CUTQ(f)::B(F)
- B(a);N_GUARD::B(F)
- Tries
- Try
- S(G);P_SPINB(F)
- Threat
- DUALS(5)
- Vars
- Q(f);CHECK,XB(F)::QAR(A)+B(C)
- R(b);CHECK,XB(F)::QAR(A)+B(C)
- Q(f);N_GUARD,N_SPINB(c),XR(I)::P=Q
- Q(f);N_GUARD,N_SPINB(c)::P=Q
- R(b);N_PINB(F)::QAR(A)+B(C)
- R(b);N_PINB(F)::B(F)
- R(b);N_PINB(F),N_SPINB(c)::B(F)
- S(g);N_PINB(F)::QAR(A)+B(C),XS(g)
- Refutation
- S(g);N_SPINB(c),XR(I)
- Try
- S(G);P_SPINB(F),P_SPINS(G),XP(e)
- Threat
- DUALS(6)
- Vars
- Q(f);CHECK,XB(F)::QAR(A)+B(C)
- R(b);CHECK,XB(F)::QAR(A)+B(C)
- S(g);N_SPINB(c),XR(I)::P(E)
- Refutation
- R(i);CHECK,XS(G)
- Try
- B(F);CHECK,P_SPINS(G)
- Vars
- R(b);N_GUARD,P_SPINR(b)::B(F),XR(b)
- Refutation
- Q(f);XB(F)
- Try
- R(B);CHECK,XB(c)
- Vars
- S(g);P_SPINS(g),XR(B)::QAB(A)
- Refutation
- P(h);P_SPINP(h),XR(B)
- Try
- Q(A);CHECK
- Vars
- B(a);XQ(A)::B(F)
- Refutation
- R(b);XQ(A)
- Try
- P(E);CHECK
- Refutation
- P(e);CHECK,XP(E)
- Try
- Actual
- S(G);P_SPINB(F)
- Threat
- DUALS(5)
- Vars
- Q(f);CHECK,XB(F)::QAR(A)+B(C)
- R(b);CHECK,XB(F)::QAR(A)+B(C)
- Q(f);N_GUARD,N_SPINB(c),XR(I)::P=Q
- S(g);N_GUARD,N_SPINB(c),XR(I)::S(G)
- Q(f);N_GUARD,N_SPINB(c)::P=Q
- R(b);N_PINB(F)::QAR(A)+B(C)
- R(b);N_PINB(F)::B(F)
- R(b);N_PINB(F),N_SPINB(c)::B(F)
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).