MESON Chess Problem Database
Problem Display
PID: 251718 (4Q3/2p2R2/4B1PK/b2N4/1n2kB2/2Pn4/q2R1Pb1/4N3 w - - 0 1)
Forster, Klaus
Die Schwalbe, 2021
#2
11 + 7
SOLUTION
- SOUND
- Sets
- 1...Qb1
- 2.Re2#
- 1...Qb3
- 2.Re2#
- 1...Qc4
- 2.Re2#
- 1...Qxd5
- 2.Re2#
- 1...Qa1
- 2.Re2#
- 1...Qa3
- 2.Re2#
- 1...Qa4
- 2.Re2#
- 1...Bf1
- 2.f3#
- 1...Bh3
- 2.f3#
- 1...Sc1
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxe1
- 2.Bg4#
- 1...Sb2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Re2#
- 2.Rd4#
- 1...Sxf2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxf4
- 2.Bf5#
- 1...Sc5
- 2.Bf5#
- 2.Rd4#
- 1...Se5
- 2.Bf5#
- 2.Rd4#
- 1...Qb1
- Tries
- 1.Se3?
- threat
- 2.Bd5#
- 1...Qd5
- 2.Bxd5#
- 1...Se5
- 2.Rd4#
- 1...Sd5
- 2.Bxd5#
- 1...Qxe6!
- threat
- 1.Sxb4?
- threat
- 2.Bd5#
- 1...Qxe6
- 2.Re2#
- 1...Qd5
- 2.Bxd5#
- 2.Re2#
- 1...Se5
- 2.Rd4#
- 1...Bxb4!
- threat
- 1.Sxc7?
- threat
- 2.Bd5#
- 1...Qxe6
- 2.Re2#
- 1...Qd5
- 2.Bxd5#
- 2.Re2#
- 1...Se5
- 2.Rd4#
- 1...Sd5
- 2.Bxd5#
- 1...Bxc7!
- threat
- 1.Bh2?
- threat
- 2.Sf6#
- 1...Qxd5
- 2.Bf5#
- 2.Re2#
- 1...Sxe1
- 2.Bh3#
- 2.Bg4#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxf2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxd5
- 2.Bf5#
- 1...Sf4
- 2.Bf5#
- 1...Qxd2+!
- threat
- 1.Bg3?
- threat
- 2.Sf6#
- 1...Qxd5
- 2.Bf5#
- 2.Re2#
- 1...Sxe1
- 2.Bh3#
- 2.Bg4#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxf2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Sxd5
- 2.Bf5#
- 1...Sf4
- 2.Bf5#
- 1...Qxd2+!
- threat
- 1.Bh3+?
- 1...Se5
- 2.Bxg2#
- 2.Bf5#
- 2.Rd4#
- 2.Qxe5#
- 1...Kxd5!
- 1...Se5
- 1.Bg4+?
- 1...Se5
- 2.Bf5#
- 2.Rd4#
- 2.Qxe5#
- 1...Kxd5!
- 1...Se5
- 1.Bd7+?
- 1...Se5
- 2.Bf5#
- 2.Rd4#
- 2.Qxe5#
- 1...Kxd5!
- 1...Se5
- 1.Bc8+?
- 1...Se5
- 2.Bf5#
- 2.Rd4#
- 2.Qxe5#
- 1...Kxd5!
- 1...Se5
- 1.Rxd3?
- threat
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Re3#
- 2.Rd4#
- 1...Qxd5
- 2.Bxd5#
- 2.Re3#
- 1...Qxf2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 1...Sxd5
- 2.Bxd5#
- 2.Rd4#
- 1...Qc4
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Re3#
- 1...Qd2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 1...Qe2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Rd4#
- 1...Qa4
- 2.Bf5#
- 2.Bd7#
- 2.Re3#
- 2.Rd4#
- 1...Bh3
- 2.Bxh3#
- 2.Bg4#
- 2.Bf5#
- 2.Re3#
- 2.Rd4#
- 2.f3#
- 1...Bb6
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 1...Sc2
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 1...Sc6
- 2.Bf5#
- 2.Re3#
- 1...c5
- 2.Bh3#
- 2.Bg4#
- 2.Bf5#
- 2.Bd7#
- 2.Bc8#
- 2.Re3#
- 1...Sxd3!
- threat
- 1.Qb5?
- threat
- 2.Bf5#
- 1...Qxd5
- 2.Re2#
- 1...Sxe1
- 2.Qe2#
- 1...Sxf4
- 2.Sf6#
- 1...Sxd5
- 2.Qxd3#
- 1...Bh3
- 2.f3#
- 1...c5!
- threat
- 1.Se3?
- Keys
- 1.Kg5!
- threat
- 2.Sf6#
- 1...Qxd5+
- 2.Bf5#
- 1...Sxe1
- 2.Bg4#
- 1...Sxf4
- 2.Bf5#
- 1...Sxd5
- 2.Bf5#
- threat
- 1.Kg5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 8
- Sets
- Q(a);N_GUARD::R(B)
- Q(a);N_GUARD,XS(F)::R(B)
- B(b);N_GUARD::P(C)
- S(c);N_GUARD,XS(A)::QAR(K)+B(G)
- S(c);XB(E)::QAR(K)+B(G),DCHECK
- Tries
- Try
- S(F);
- Threat
- QAR(K)+B(G),DCHECK
- Vars
- Q(a);::QAR(K)+B(G),DCHECK,XQ(a)
- S(c);OGATE::R1(B)
- S(d);::QAR(K)+B(G),DCHECK,XS(d)
- Refutation
- Q(a);P_PINP(H),P_SPINQ(a),XB(G)
- Try
- S(F);XS(d)
- Threat
- QAR(K)+B(G),DCHECK
- Vars
- Q(a);N_GUARD,P_PINP(H),P_SPINQ(a),XB(G)::R(B)
- S(c);OGATE::R1(B)
- Refutation
- B(f);XS(F)
- Try
- S(F);XP(g)
- Threat
- QAR(K)+B(G),DCHECK
- Vars
- Q(a);N_GUARD,P_PINP(H),P_SPINQ(a),XB(G)::R(B)
- S(c);OGATE::R1(B)
- S(d);::QAR(K)+B(G),DCHECK,XS(d)
- Refutation
- B(f);XS(F)
- Try
- B(E);
- Threat
- S(F)
- Vars
- S(d);SBLOCK,XS(F)::QAR(K)+B(G),DCHECK
- S(c);::QAR(K)+B(G),DCHECK
- Refutation
- Q(a);CHECK,XR(B)
- Try
- B(E);
- Threat
- S(F)
- Vars
- S(d);SBLOCK,XS(F)::QAR(K)+B(G),DCHECK
- S(c);::QAR(K)+B(G),DCHECK
- Refutation
- Q(a);CHECK,XR(B)
- Try
- B(G);CHECK
- Refutation
- K(e);P_SPINS(c),S_FLIGHT,XS(F)
- Try
- B(G);CHECK
- Refutation
- K(e);P_SPINS(c),S_FLIGHT,XS(F)
- Try
- B(G);CHECK
- Refutation
- K(e);P_SPINS(c),S_FLIGHT,XS(F)
- Try
- B(G);CHECK
- Refutation
- K(e);P_SPINS(c),S_FLIGHT,XS(F)
- Try
- R(B);XS(c)
- Threat
- DUALS(7)
- Refutation
- S(d);XR(B)
- Try
- Q(K);
- Threat
- B(G)
- Vars
- Q(a);N_GUARD,XS(F)::R(B)
- S(c);OGATE,XS(A)::QAR2(K)
- S(c);SBLOCK,XB(E)::S(F)
- S(d);N_GUARD,XS(F)::QAB1(K),XS(c)
- B(b);N_GUARD::P(C)
- Refutation
- P(g);
- Try
- Actual
- K(I);S_FLIGHT
- Threat
- S(F)
- Vars
- Q(a);CHECK,SBLOCK,XS(F)::QAR(K)+B(G),DCHECK
- S(c);N_GUARD,XS(A)::QAR(K)+B(G)
- S(c);XB(E)::QAR(K)+B(G),DCHECK
- S(d);SBLOCK,XS(F)::QAR(K)+B(G),DCHECK
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).