MESON Chess Problem Database
Problem Display
PID: 162923 (2r5/2pR1P1B/4p2q/2Q4p/NPpPP1p1/b1Pk4/3P1P2/N2RK3 w - - 0 1)
Forster, Klaus
Die Schwalbe, 2016
#2
14 + 9
SOLUTION
- SOUND
- Sets
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Qf8
- 2.e5#
- 1...Bb2
- 2.Sxb2#
- 1...Bxb4
- 2.Sb2#
- 1...Qxd2+
- Tries
- 1.Qa7?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.e5#
- 1...c5
- 2.dxc5#
- 1...Qg5!
- threat
- 1.Qe7?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...c5
- 2.dxc5#
- 1...Qg5!
- threat
- 1.Qf8?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Qxf8
- 2.e5#
- 1...Bxb4
- 2.Sb2#
- 1...c5
- 2.dxc5#
- 1...Qg5!
- threat
- 1.Qa5?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.e5#
- 1...c5
- 2.dxc5#
- 1...Qg5!
- threat
- 1.Qb5?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.e5#
- 1...c5
- 2.dxc5#
- 1...Qg5!
- threat
- 1.Qd5?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.e5#
- 1...c5!
- threat
- 1.Qf5?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...c5
- 2.dxc5#
- 1...Qf8!
- threat
- 1.Qg5?
- threat
- 2.Sc5#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.Qe3#
- 2.e5#
- 1...c5
- 2.dxc5#
- 1...Qxg5!
- threat
- 1.Qc6?
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.e5#
- 1...Qg5!
- threat
- 1.d5?
- threat
- 2.Qd4#
- 2.dxe6#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.Qxe3#
- 2.dxe3#
- 1...Qxh7
- 2.Qe3#
- 2.Qd4#
- 1...exd5
- 2.Rxd5#
- 2.Qd4#
- 2.Qxd5#
- 1...Qg6
- 2.Qe3#
- 2.Qd4#
- 1...Qg5
- 2.Qd4#
- 1...Qf4
- 2.Qd4#
- 1...Qg7
- 2.Qe3#
- 1...Qf8
- 2.Qe3#
- 2.Qd4#
- 2.e5#
- 1...Qf6
- 2.Qe3#
- 1...Rd8
- 2.Qd4#
- 1...e5!
- threat
- 1.e5+?
- 1...Qg6
- 2.Bxg6#
- 1...Qxh7!
- 1...Qg6
- 1.Qa7?
- Keys
- 1.Qe5!
- threat
- 2.Sc5#
- 1...Qxd2+
- 2.Rxd2#
- 1...Qe3+
- 2.dxe3#
- 1...Bxb4
- 2.Sb2#
- 1...Qf8
- 2.Qg3#
- 1...c5
- 2.dxc5#
- threat
- 1.Qe5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 1
- Sets
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- Q(g);N_GUARD::B(N)+P(J)
- B(a);N_GUARD::S(G),XB(a)
- B(a);N_GUARD,XP(H)::S(G)
- Tries
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::B(N)+P(J)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- Q(g);N_GUARD,XQ(K)::B(N)+P(J)
- B(a);N_GUARD,XP(H)::S(G)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::B(N)+P(J)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);P_PINP(c)
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::B(N)+P(J)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::B(N)+P(J)
- Refutation
- P(h);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);
- Try
- Q(K);
- Threat
- S(G)
- Vars
- B(a);N_GUARD,XP(H)::S(G)
- P(h);OGATE::R(L)+P(I),XP(h)
- Refutation
- Q(g);XQ(K)
- Try
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::B(N)+P(J)
- Refutation
- Q(g);
- Try
- P(I);
- Threat
- DUALS(2)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);::QAR1(K)
- Q(g);N_GUARD::QAR1(K)
- R(i);::QAR1(K)
- Refutation
- P(f);
- Try
- P(J);CHECK
- Vars
- Q(g);N_GUARD,P_SPINQ(g)::B(N),XQ(g)
- Refutation
- Q(g);XB(N)
- Try
- Actual
- Q(K);
- Threat
- S(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XP(D)::R1(B),XQ(g)
- Q(g);CHECK,OGATE::R(B)+P(D),XQ(g)
- B(a);N_GUARD,XP(H)::S(G)
- Q(g);N_GUARD::QAR(K)
- P(h);OGATE::R(L)+P(I),XP(h)
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).