MESON Chess Problem Database
Problem Display
PID: 139566 (8/2NR2nr/K2N1q2/p7/p2k4/QPp3P1/2BnR3/8 w - - 0 1)
Ellerman, Arnoldo
L'Echiquier, 1926
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Qh4
- 2.Sc4#
- 2.Sdb5#
- 2.Sf5#
- 2.Sb7#
- 2.Sf7#
- 2.Sc8#
- 2.Sde8#
- 1...Qe5
- 2.Sdb5#
- 2.Sf5#
- 1...Qg5
- 2.Sdb5#
- 2.Sf5#
- 1...Qe7
- 2.Sdb5#
- 2.Sf5#
- 1...Qd8
- 2.Sdb5#
- 2.Sf5#
- 1...Qf1
- 2.Sc4#
- 2.Sdb5#
- 2.Sf5#
- 2.Sb7#
- 2.Sf7#
- 2.Sc8#
- 2.Sde8#
- 1...Qf2
- 2.Sc4#
- 2.Sdb5#
- 2.Sf5#
- 2.Sb7#
- 2.Sf7#
- 2.Sc8#
- 2.Sde8#
- 1...Qf3
- 2.Sdb5#
- 2.Sf5#
- 1...Qf4
- 2.Sdb5#
- 2.Sf5#
- 1...Qf5
- 2.Sdb5#
- 2.Sxf5#
- 1...Qxd6+
- 2.Rxd6#
- 2.Qxd6#
- 1...Qf7
- 2.Sdb5#
- 2.Sf5#
- 2.Sxf7#
- 1...Qf8
- 2.Sdb5#
- 2.Sf5#
- 1...Sb1
- 2.Re4#
- 1...Sf1
- 2.Re4#
- 1...Sxb3
- 2.Re4#
- 1...Sf3
- 2.Re4#
- 1...Sc4
- 2.Re4#
- 1...Se4
- 2.Rxe4#
- 1...Se6
- 2.Sdb5#
- 2.Sf5#
- 2.Sf7#
- 1...Qh4
- Tries
- 1.Kb5?
- threat
- 2.Sf5#
- 2.Qc5#
- 1...Qg5+
- 2.Sf5#
- 1...Qf5+
- 2.Sxf5#
- 1...Rh5+
- 2.Sf5#
- 1...Qxd6
- 2.Rxd6#
- 2.Qc5#
- 2.Qxd6#
- 1...Sxb3
- 2.Sf5#
- 2.Re4#
- 2.Qxa4#
- 1...Se4
- 2.Rxe4#
- 1...Sf5
- 2.Sxf5#
- 2.Qc5#
- 1...Se6
- 2.Sf5#
- 2.Sf7#
- 1...Qe5+!
- threat
- 1.Ka7?
- threat
- 2.Sdb5#
- 2.Sf5#
- 1...Qxd6
- 2.Rxd6#
- 2.Qxd6#
- 1...Sxb3
- 2.Re4#
- 1...Se4
- 2.Rxe4#
- 1...Qf5
- 2.Sdb5#
- 2.Sxf5#
- 1...Sf5
- 2.Sdb5#
- 2.Sxf5#
- 1...axb3!
- threat
- 1.Se6+?
- 1...Kd5
- 2.Qc5#
- 1...Sxe6
- 2.Sb5#
- 2.Sf5#
- 2.Sf7#
- 1...Qxe6!
- 1...Kd5
- 1.Qb4+?
- 1...Sc4
- 2.Re4#
- 2.Qxc4#
- 1...axb4!
- 1...Sc4
- 1.Qxa4+?
- 1...Sc4
- 2.Qxc4#
- 1...Kc5!
- 1...Sc4
- 1.Kb5?
- Keys
- 1.Re5!
- threat
- 2.Qc5#
- 1...Qf1+
- 2.Sc4#
- 1...Qxd6+
- 2.Qxd6#
- 1...Kxe5
- 2.Qc5#
- 1...Qxe5
- 2.Sf5#
- 1...Sxb3
- 2.Re4#
- 1...Se4
- 2.Rxe4#
- 1...Se6
- 2.Sf7#
- threat
- 1.Re5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 4
- Sets
- S(a);N_GUARD::R1(B)
- S(a);N_GUARD,XP(D)::R1(B)
- S(a);N_GUARD::R1(B),XS(a)
- Tries
- Try
- K(F);N_SPINS(G),S_FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(f);CHECK::R(I)+S(G),DCHECK
- Q(f);CHECK::R(I)+S(G),DCHECK,XQ(f)
- R(h);CHECK::R(I)+S(G),DCHECK
- S(a);N_GUARD::R1(B),XS(a)
- Refutation
- Q(f);CHECK
- Try
- K(F);N_SPINS(G),P-FLIGHT
- Threat
- DUALS(2)
- Vars
- S(a);N_GUARD,XP(D)::R1(B)
- S(a);N_GUARD::R1(B),XS(a)
- Refutation
- P(c);XP(D)
- Try
- S(H);CHECK,N_SPINS(G)
- Vars
- K(d);P-FLIGHT::QAR1(C)
- Refutation
- Q(f);P_PINS(G),XS(H)
- Try
- Q(C);CHECK
- Refutation
- P(e);XQ(C)
- Try
- Q(C);CHECK,XP(c)
- Vars
- S(a);N_GUARD,P_SPINS(a)::QAR1(C),XS(a)
- Refutation
- K(d);S_FLIGHT
- Try
- Actual
- R(B);
- Threat
- QAB1(C)
- Vars
- Q(f);CHECK,N_PINS(G)::R(I)+S(G)
- Q(f);CHECK,OGATE,P_SPINQ(f),XS(G)::QAR2(C),XQ(f)
- K(d);S_FLIGHT,XR(B)::QAR2(C)
- Q(f);N_PINS(G),SBLOCK,XR(B)::R(I)+S(G),DCHECK
- S(a);N_GUARD,XP(D)::R1(B)
- S(a);N_GUARD::R1(B),XS(a)
- S(g);N_PINS(G)::R(I)+S(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).