MESON Chess Problem Database
Problem Display
PID: 181244 (4q3/4pB2/3NpN2/2p1k3/Q1r3rB/8/4n3/3RKR2 w - - 0 1)
Monreal, Pierre
Bulletin Ouvrier des Echecs, 1953
#2
8 + 8
SOLUTION
- SOUND
- Sets
- 1...Qd7
- 2.Sxd7#
- 1...Qxf7
- 2.Sxf7#
- 2.Sd7#
- 1...Qa8
- 2.Sd7#
- 1...Qb8
- 2.Sd7#
- 1...Qf8
- 2.Sd7#
- 1...Qg8
- 2.Sd7#
- 1...Qh8
- 2.Sd7#
- 1...Rc1
- 2.Sxg4#
- 1...Rc2
- 2.Sxg4#
- 1...Rc3
- 2.Sxg4#
- 1...Rg1
- 2.Sxc4#
- 1...Rg2
- 2.Sxc4#
- 1...Rg3
- 2.Sxc4#
- 1...Rg5
- 2.Sxc4#
- 1...Rg6
- 2.Sxc4#
- 1...Rg7
- 2.Sxc4#
- 1...Rg8
- 2.Sxc4#
- 1...Sd4
- 2.Sxc4#
- 1...Sf4
- 2.Sxg4#
- 1...exf6
- 2.Bxf6#
- 1...Qd7
- Tries
- 1.Bg3+?
- 1...Rcf4
- 2.Sxg4#
- 1...Rxg3
- 2.Sxc4#
- 1...Rgf4
- 2.Sg4#
- 1...Sf4
- 2.Sxg4#
- 1...Sxg3!
- 1...Rcf4
- 1.Bxe8?
- threat
- 2.Sf7#
- 2.Sd7#
- 1...exf6
- 2.Bxf6#
- 1...Rcd4
- 2.Sf7#
- 1...Rgd4
- 2.Sf7#
- 1...Sd4
- 2.Sxc4#
- 2.Sf7#
- 1...Rcf4
- 2.Sd7#
- 1...Rgf4
- 2.Sd7#
- 1...Rg7
- 2.Sxc4#
- 2.Sd7#
- 1...Sf4
- 2.Sxg4#
- 2.Sd7#
- 1...exd6!
- threat
- 1.Qd7?
- threat
- 2.Qxe6#
- 1...Qxd7
- 2.Sxd7#
- 1...Qxf7
- 2.Sxf7#
- 1...exd6
- 2.Qxd6#
- 1...exf6
- 2.Bxf6#
- 1...Sd4
- 2.Sxc4#
- 1...Sf4
- 2.Sxg4#
- 1...Qc8!
- threat
- 1.Qa1+?
- 1...Rc3
- 2.Sxg4#
- 1...Rcd4
- 2.Sc4#
- 1...Rgd4
- 2.Sxc4#
- 1...Sd4
- 2.Sxc4#
- 1...Sc3!
- 1...Rc3
- 1.Bg3+?
- Keys
- 1.Qxc4!
- threat
- 2.Sxg4#
- 2.Qxe6#
- 2.Qxc5#
- 1...Qxf7
- 2.Sxf7#
- 2.Sxg4#
- 2.Sd7#
- 2.Qxc5#
- 1...Rxc4
- 2.Sxc4#
- 1...Rxh4
- 2.Qxe6#
- 2.Qxc5#
- 1...exd6
- 2.Sxg4#
- 1...exf6
- 2.Bxf6#
- 2.Qxc5#
- 1...Rd4
- 2.Qxe6#
- 1...Sd4
- 2.Qxc5#
- 1...Qb5
- 2.Sxg4#
- 2.Qxe6#
- 1...Qc6
- 2.Sxg4#
- 2.Qxe6#
- 1...Qd7
- 2.Sxg4#
- 2.Sxd7#
- 2.Qxc5#
- 1...Qa8
- 2.Sxg4#
- 2.Sd7#
- 2.Qxe6#
- 1...Qc8
- 2.Sxg4#
- 1...Qg8
- 2.Sd7#
- 2.Qxe6#
- 2.Qxc5#
- 1...Rg1
- 2.Qxe2#
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Rg2
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Rg3
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Re4
- 2.Qxe6#
- 2.Qxe4#
- 2.Qxc5#
- 1...Rf4
- 2.Qxe6#
- 2.Qxc5#
- 1...Rg5
- 2.Qxe2#
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Rg6
- 2.Qxe2#
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Rg7
- 2.Qxe2#
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Rg8
- 2.Qxe2#
- 2.Qxe6#
- 2.Qe4#
- 2.Qxc5#
- 1...Sc3
- 2.Sxg4#
- 2.Qxe6#
- 1...Sf4
- 2.Sxg4#
- 2.Qc3#
- 2.Qe4#
- threat
- 1.Qxc4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 18
- Sets
- Q(h);N_GUARD::S(G),XQ(h)
- Q(h);N_GUARD::S(G)
- R(b);N_GUARD,P_PINR(A)::S(G),XR(c)
- R(b);N_GUARD::S(G),XR(c)
- R(c);N_GUARD,P_PINR(C)::S(F),XR(b)
- R(c);N_GUARD::S(F),XR(b)
- S(a);S_CUTR(c)::S(F),XR(b)
- S(a);S_CUTR(b)::S(G),XR(c)
- P(g);OGATE,XS(G)::B(E),XP(g)
- Tries
- Try
- B(E);CHECK
- Vars
- R(b);P_SPINR(b)::S(G),XR(c)
- R(c);XB(E)::S(F),XR(b)
- R(c);P_SPINR(c)::S(G)
- S(a);P_SPINS(a)::S(G),XR(c)
- Refutation
- S(a);XB(E)
- Try
- B(H);XQ(h)
- Threat
- DUALS(2)
- Vars
- P(g);OGATE,XS(G)::B(E),XP(g)
- R(b);::S(F)
- R(c);::S(F)
- R(b);::S(G)
- R(c);::S(G)
- Refutation
- P(g);XS(F)
- Try
- Q(D);
- Threat
- QAR1(D),XP(f)
- Vars
- Q(h);XQ(D)::S(G),XQ(h)
- Q(h);XB(H)::S(F),XQ(h)
- P(g);OGATE,XS(F)::QAB1(D),XP(g)
- P(g);OGATE,XS(G)::B(E),XP(g)
- S(a);S_CUTR(c)::S(F),XR(b)
- S(a);S_CUTR(b)::S(G),XR(c)
- Refutation
- Q(h);
- Try
- Q(D);CHECK
- Vars
- R(b);P_SPINR(b)::S(G),XR(c)
- R(b);P_SPINR(b)::S(F)
- R(c);P_SPINR(c)::S(F),XR(b)
- S(a);P_SPINS(a)::S(F),XR(b)
- Refutation
- S(a);P_SPINS(a)
- Try
- Actual
- Q(D);XR(b)
- Threat
- DUALS(3)
- Vars
- R(c);XQ(D)::S(F),XR(c)
- P(g);XS(F)::S(G),XR(c)
- R(c);::QAR1(D),XP(f)
- S(a);::QAR2(D),XP(d)
- Q(h);::S(G),XR(c)
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).