MESON Chess Problem Database
Problem Display
PID: 187497 (4QR2/2p3p1/1pb1K3/bn1p4/4kpr1/nN2P3/2PR1PP1/1B1N1r2 w - - 0 1)
Degener, Udo
Degenkolbe, Mirko
Die Schwalbe, 2018
#2
11 + 12
SOLUTION
- SOUND
- Sets
- 1...Re1
- 2.f3#
- 1...Rg1
- 2.f3#
- 1...Rh1
- 2.f3#
- 1...Rxg2
- 2.Rxf4#
- 1...Rg3
- 2.Rxf4#
- 1...Rh4
- 2.Qg6#
- 1...Rg5
- 2.Rxf4#
- 1...Rg6+
- 2.Qxg6#
- 1...Bxd2
- 2.Sxd2#
- 1...Bb7
- 2.Kd7#
- 1...Bd7+
- 2.Kxd7#
- 1...Ba8
- 2.Kd7#
- 1...Sxc2
- 2.Bxc2#
- 1...Sc4
- 2.c3#
- 1...Sc3
- 2.Rd4#
- 1...Sd4+
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...Sa7
- 2.Rd4#
- 1...f3
- 2.gxf3#
- 1...d4
- 2.Qxc6#
- 1...g5
- 2.Qg6#
- 1...Re1
- Tries
- 1.Sc3+?
- 1...Sxc3
- 2.Rd4#
- 1...Bxc3!
- 1...Sxc3
- 1.Qh5?
- threat
- 2.Qe5#
- 2.Qf5#
- 1...Rg6+
- 2.Qxg6#
- 1...Sd4+
- 2.Rxd4#
- 1...Rxg2
- 2.Rxf4#
- 1...Rg5
- 2.Rxf4#
- 2.Qf3#
- 1...Bc3
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 2.c3#
- 1...Sd6
- 2.Rd4#
- 2.Qe5#
- 1...g5
- 2.Qg6#
- 2.Qh7#
- 1...g6
- 2.Qe5#
- 1...Bd7+!
- threat
- 1.Qxc6?
- threat
- 2.Qxd5#
- 1...Sd4+
- 2.Rxd4#
- 1...Rg5
- 2.Rxf4#
- 1...Sc3
- 2.Rd4#
- 1...Rg6+!
- threat
- 1.c3+?
- 1...Sc2
- 2.Bxc2#
- 1...Sxb1!
- 1...Sc2
- 1.c4+?
- 1...Sc2
- 2.Bxc2#
- 1...Sxb1!
- 1...Sc2
- 1.Sc3+?
- Keys
- 1.Re2!
- threat
- 2.exf4#
- 1...Rg6+
- 2.Qxg6#
- 1...Bd7+
- 2.Kxd7#
- 1...Sd4+
- 2.exd4#
- 1...Rxf2
- 2.Sxf2#
- 1...Rxg2
- 2.Rxf4#
- 1...Sxc2
- 2.Bxc2#
- 1...fxe3
- 2.Rxe3#
- 1...Re1
- 2.f3#
- 1...Rg3
- 2.Rxf4#
- 1...Bd2
- 2.Sxd2#
- 1...Sc4
- 2.c3#
- 1...Sc3
- 2.Sd2#
- 1...f3
- 2.gxf3#
- threat
- 1.Re2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 10
- Sets
- R(a);N_GUARD::P(E)
- R(e);N_GUARD,XP(F)::R1(K),XP(d)
- R(e);N_GUARD::R1(K),XP(d)
- R(e);N_GUARD::QAB(J)
- R(e);CHECK,N_GUARD::QAB(J),XR(e)
- B(f);XR(D)::S(G),XB(f)
- B(j);::QAR(J)+K(I)
- B(j);CHECK::QAR(J)+K(I),XB(j)
- S(b);OGATE,P_SPINS(b),XP(C)::B(A),XS(b)
- S(b);N_GUARD::B(A)+P(C)
- S(g);N_GUARD::R1(D)
- S(g);CHECK,N_GUARD::R1(D),XS(g)
- P(d);OGATE::P(F),XP(d)
- P(h);OGATEB::QAB(J),XB(j)
- P(l);S_CUTR(e)::QAB(J)
- Tries
- Try
- S(B);CHECK
- Vars
- S(g);XS(B)::R1(D)
- Refutation
- B(f);XS(B)
- Try
- Q(J);
- Threat
- DUALS(2)
- Vars
- R(e);CHECK,N_GUARD::QAB(J),XR(e)
- S(g);CHECK,N_GUARD::R1(D),XS(g)
- R(e);N_GUARD,XP(F)::R1(K),XP(d)
- B(f);::QAB1(J)
- P(l);::QAR1(J)
- Refutation
- B(j);CHECK
- Try
- Q(J);P_PINP(h),XB(j)
- Threat
- QAB1(J),XP(h)
- Vars
- S(g);CHECK,N_GUARD::R1(D),XS(g)
- R(e);N_GUARD::R1(K),XP(d)
- S(g);N_GUARD::R1(D)
- Refutation
- R(e);CHECK
- Try
- P(C);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::B(A),XS(b)
- Refutation
- S(b);XB(A)
- Try
- P(C);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::B(A),XS(b)
- Refutation
- S(b);XB(A)
- Try
- Actual
- R(D);
- Threat
- R(D)+P(H),XP(d)
- Vars
- R(e);CHECK,N_GUARD::QAB(J),XR(e)
- B(j);CHECK::QAR(J)+K(I),XB(j)
- S(g);CHECK,OGATE::R(D)+P(H),XS(g)
- R(a);XP(E)::S(B),XR(a)
- R(e);N_GUARD,XP(F)::R1(K),XP(d)
- S(b);OGATE,P_SPINS(b),XP(C)::B(A),XS(b)
- P(d);OGATE,P_SPINP(d),XP(H)::R1(D),XP(d)
- R(a);N_GUARD::P(E)
- R(e);N_GUARD::R1(K),XP(d)
- B(f);N_GUARD::S(G),XB(f)
- S(b);N_GUARD::B(A)+P(C)
- S(g);S_CUTB(f)::S(G)
- P(d);OGATE::P(F),XP(d)
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).