MESON Chess Problem Database
Problem Display
PID: 21721 (4N3/2p5/4n1Q1/1Bpkp3/4R3/B1b5/2P1n2K/1N6 w - - 0 1)
Guarini, Carlo
Lo Scacchistica di Roma, 1920
#2
8 + 7
| 3360 | Simple Two-move Themes | 1924 |
| 136 | Problem Observer | 2010 |
SOLUTION
- SOUND
- Sets
- 1...Ba1
- 2.c4#
- 1...Be1
- 2.c4#
- 1...Bb2
- 2.c4#
- 1...Bd2
- 2.c4#
- 1...Bb4
- 2.c4#
- 1...Bd4
- 2.c4#
- 1...Ba5
- 2.c4#
- 1...Sc1
- 2.Sxc3#
- 1...Sg1
- 2.Sxc3#
- 1...Sg3
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S2f4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 1...S6f4
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 2.Bc4#
- 1...Sf8
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...c4
- 2.Sf6#
- 1...c6
- 2.Bc4#
- 1...Ba1
- Tries
- 1.Kh1?
- 1...Ba1
- 2.c4#
- 1...Be1
- 2.c4#
- 1...Bb2
- 2.c4#
- 1...Bd2
- 2.c4#
- 1...Bb4
- 2.c4#
- 1...Bd4
- 2.c4#
- 1...Ba5
- 2.c4#
- 1...Sc1
- 2.Sxc3#
- 1...Sg1
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S2f4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 1...S6f4
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 2.Bc4#
- 1...Sf8
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...c4
- 2.Sf6#
- 1...c6
- 2.Bc4#
- 1...Sg3+!
- 1...Ba1
- 1.Sxc7+?
- 1...Sxc7
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Kd6!
- 1...Sxc7
- 1.Bc1?
- 1...Sxc1
- 2.Sxc3#
- 1...Ba1
- 2.c4#
- 1...Be1
- 2.c4#
- 1...Bb2
- 2.c4#
- 1...Bd2
- 2.c4#
- 1...Bb4
- 2.c4#
- 1...Bd4
- 2.c4#
- 1...Ba5
- 2.c4#
- 1...Sg1
- 2.Sxc3#
- 1...Sg3
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S2f4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 1...S6f4
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 2.Bc4#
- 1...Sf8
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...c6
- 2.Bc4#
- 1...c4!
- 1...Sxc1
- 1.Bb2?
- 1...Bxb2
- 2.c4#
- 1...Be1
- 2.Rxe5#
- 2.c4#
- 1...Bd2
- 2.Rxe5#
- 2.c4#
- 1...Bb4
- 2.Rxe5#
- 2.c4#
- 1...Bd4
- 2.c4#
- 1...Ba5
- 2.Rxe5#
- 2.c4#
- 1...Sc1
- 2.Sxc3#
- 1...Sg1
- 2.Sxc3#
- 1...Sg3
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S2f4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 1...S6f4
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 2.Bc4#
- 1...Sf8
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...c6
- 2.Bc4#
- 1...c4!
- 1...Bxb2
- 1.Bb4?
- 1...Bxb4
- 2.c4#
- 1...Ba1
- 2.c4#
- 1...Be1
- 2.c4#
- 1...Bb2
- 2.c4#
- 1...Bd2
- 2.c4#
- 1...Bd4
- 2.c4#
- 1...Sc1
- 2.Sxc3#
- 1...Sg1
- 2.Sxc3#
- 1...Sg3
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S2f4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 1...S6f4
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 2.Bc4#
- 1...Sf8
- 2.Sxc7#
- 2.Bc4#
- 2.Bc6#
- 2.Qc6#
- 1...c4
- 2.Sf6#
- 1...c6
- 2.Bc4#
- 1...cxb4!
- 1...Bxb4
- 1.Rc4?
- threat
- 2.Qe4#
- 1...e4
- 2.Qxe4#
- 1...Sg3
- 2.Sxc3#
- 1...S2d4
- 2.Sxc3#
- 1...S6d4
- 2.Sxc7#
- 2.Rxc5#
- 1...S6f4
- 2.Sxc7#
- 2.Qc6#
- 1...Sg5
- 2.Sxc7#
- 2.Qc6#
- 1...Sg7
- 2.Sxc7#
- 2.Qc6#
- 1...Sd8
- 2.Sxc7#
- 1...Sf8
- 2.Sxc7#
- 2.Qc6#
- 1...Bd4!
- threat
- 1.Kh1?
- Keys
- 1.Rd4+!
- 1...Kxd4
- 2.Qd3#
- 1...Bxd4
- 2.c4#
- 1...S2xd4
- 2.Sxc3#
- 1...S6xd4
- 2.Sxc7#
- 1...cxd4
- 2.Sf6#
- 1...exd4
- 2.Qf5#
- 1...Kxd4
- 1.Rd4+!
This is a version of 21720
FEATURES
- Static
- TYPE = CHECKING_KEY
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 12
- Sets
- B(b);OGATE::P(B)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- P(c);::S(H)
- P(g);SBLOCK::B(F)
- Tries
- Try
- K(C);P-FLIGHT
- Vars
- B(b);OGATE::P(B)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- P(c);::S(H)
- P(g);SBLOCK::B(F)
- Refutation
- S(a);CHECK
- Try
- S(H);CHECK,XP(g)
- Refutation
- K(d);P-FLIGHT,P_SPINP(c),P_SPINS(f)
- Try
- B(D);
- Vars
- S(a);N_GUARD,XB(D)::S(A),XB(b)
- B(b);OGATE::P(B)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- P(g);SBLOCK::B(F)
- Refutation
- P(c);
- Try
- B(D);
- Vars
- B(b);OGATE,XB(D)::P(B)
- B(b);OGATE::P(B)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- P(g);SBLOCK::B(F)
- Refutation
- P(c);
- Try
- B(D);
- Vars
- B(b);OGATE,XB(D)::P(B)
- B(b);OGATE::P(B)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- P(c);::S(H)
- P(g);SBLOCK::B(F)
- Refutation
- P(c);XB(D)
- Try
- R(E);
- Threat
- QAB1(G)
- Vars
- P(e);::QAB1(G),XP(e)
- S(a);N_GUARD::S(A),XB(b)
- S(f);N_GUARD::S(H),XP(g)
- Refutation
- B(b);
- Try
- Actual
- R(E);CHECK
- Vars
- K(d);P-FLIGHT,XR(E)::QAR1(G)
- B(b);OGATE,SBLOCK,XR(E)::P(B)
- S(a);SBLOCK,XR(E)::S(A),XB(b)
- S(f);SBLOCK,XR(E)::S(H),XP(g)
- P(c);SBLOCK,XR(E)::S(H)
- P(e);SBLOCK,S_CUTB(b),S_CUTP(c),S_CUTS(a),S_CUTS(f),XR(E)::QAR2(G)
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).