MESON Chess Problem Database
Problem Display
PID: 6972 (4N3/5r1n/6PK/4kp1R/2BppRp1/8/3b2NB/5Q2 w - - 0 1)
Valve, Leo Erland
Die Schwalbe, 1935
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Ra7
- 2.Rxf5#
- 1...Rb7
- 2.Rxf5#
- 1...Rc7
- 2.Rxf5#
- 1...Rd7
- 2.Rxf5#
- 1...Re7
- 2.Rxf5#
- 1...Rg7
- 2.Rxf5#
- 1...Be1
- 2.Rfxf5#
- 1...Bc3
- 2.Rxg4#
- 2.Rfxf5#
- 1...Bb4
- 2.Rxg4#
- 2.Rfxf5#
- 1...Bxf4+
- 2.Bxf4#
- 2.Qxf4#
- 1...Ba5
- 2.Rxg4#
- 2.Rfxf5#
- 1...Sg5
- 2.Rxf5#
- 1...Sf6
- 2.Rxf5#
- 1...e3
- 2.Rxg4#
- 1...Ra7
- Tries
- 1.Ba2?
- threat
- 2.Qb5#
- 1...Bxf4+
- 2.Bxf4#
- 2.Qxf4#
- 1...Rb7
- 2.Rxf5#
- 1...Rc7
- 2.Rxf5#
- 1...Rd7
- 2.Rxf5#
- 1...Bb4
- 2.Rxg4#
- 2.Rfxf5#
- 1...Sf6
- 2.Rxf5#
- 1...d3!
- threat
- 1.Bb3?
- threat
- 2.Qb5#
- 1...Bxf4+
- 2.Bxf4#
- 2.Qxf4#
- 1...Rb7
- 2.Rxf5#
- 1...Rc7
- 2.Rxf5#
- 1...Rd7
- 2.Rxf5#
- 1...Bb4
- 2.Rxg4#
- 2.Rfxf5#
- 1...Sf6
- 2.Rxf5#
- 1...d3!
- threat
- 1.Bxf7?
- threat
- 2.Rxf5#
- 2.Qb5#
- 1...Bxf4+
- 2.Bxf4#
- 2.Qxf4#
- 1...Bb4
- 2.Rxg4#
- 2.Rfxf5#
- 2.Rhxf5#
- 1...Sg5
- 2.Rxf5#
- 2.Qb5#
- 1...Sf6
- 2.Rxf5#
- 1...d3!
- threat
- 1.Qe2?
- threat
- 2.Qxe4#
- 1...Bxf4+
- 2.Bxf4#
- 1...Sg5
- 2.Rxe4#
- 1...Sf6
- 2.Rxf5#
- 1...e3
- 2.Rxg4#
- 1...Be3!
- threat
- 1.Qd3?
- threat
- 2.Qxe4#
- 1...Bxf4+
- 2.Bxf4#
- 1...Sg5
- 2.Rxe4#
- 1...Sf6
- 2.Rxf5#
- 1...e3
- 2.Re4#
- 2.Rxg4#
- 2.Rfxf5#
- 2.Qe4#
- 2.Qxd4#
- 1...exd3!
- threat
- 1.Qb1?
- threat
- 2.Qxe4#
- 2.Qb5#
- 1...Bxf4+
- 2.Bxf4#
- 1...Rb7
- 2.Rxf5#
- 2.Qxe4#
- 1...Rc7
- 2.Rxf5#
- 2.Qxe4#
- 1...Rd7
- 2.Rxf5#
- 2.Qxe4#
- 1...Bb4
- 2.Rxe4#
- 2.Rxg4#
- 2.Rfxf5#
- 2.Qxe4#
- 1...Sg5
- 2.Rxe4#
- 2.Qb5#
- 1...Sf6
- 2.Rxf5#
- 1...e3
- 2.Re4#
- 2.Rxg4#
- 2.Rfxf5#
- 2.Qe4#
- 2.Qb5#
- 1...d3!
- threat
- 1.gxf7?
- threat
- 2.Rxf5#
- 1...Bxf4+
- 2.Bxf4#
- 2.Qxf4#
- 1...Sg5
- 2.Rxf5#
- 1...d3!
- threat
- 1.Ba2?
- Keys
- 1.Qe1!
- threat
- 2.Qxe4#
- 1...Bxf4+
- 2.Bxf4#
- 1...Bxe1
- 2.Rfxf5#
- 1...Be3
- 2.Qa5#
- 1...Sg5
- 2.Rxe4#
- 1...Sf6
- 2.Rxf5#
- 1...e3
- 2.Rxg4#
- threat
- 1.Qe1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 6
- Sets
- R(g);N_GUARD::R1(F),XP(f)
- B(a);N_PINR(E)::B(C)+R(E),DCHECK,XP(f)
- S(h);N_PINR(E),N_SPINP(f)::B(C)+R(E),DCHECK,XP(f)
- S(h);S_CUTR(g)::R1(F),XP(f)
- P(c);N_PINR(E)::B(C)+R(E),XP(d)
- Tries
- Try
- B(D);
- Threat
- QAR(A)
- Vars
- R(g);N_GUARD::R1(F),XP(f)
- S(h);S_CUTR(g)::R1(F),XP(f)
- Refutation
- P(b);
- Try
- B(D);
- Threat
- QAR(A)
- Vars
- R(g);N_GUARD::R1(F),XP(f)
- S(h);S_CUTR(g)::R1(F),XP(f)
- Refutation
- P(b);
- Try
- B(D);XR(g)
- Threat
- DUALS(2)
- Vars
- S(h);::R1(F),XP(f)
- Refutation
- P(b);
- Try
- Q(A);N_PINP(f),P_PINP(c)
- Threat
- QAR1(A),XP(c)
- Vars
- B(a);CHECK,OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
- S(h);N_PINR(E)::B(C)+R(E),DCHECK,XP(c)
- S(h);S_CUTR(g)::R1(F),XP(f)
- P(c);N_PINR(E)::B(C)+R(E),XP(d)
- Refutation
- B(a);N_SPINP(c),P_SPINP(f)
- Try
- Q(A);
- Threat
- QAR1(A),XP(c)
- Vars
- B(a);CHECK,OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
- S(h);N_PINR(E),N_SPINP(f)::B(C)+R(E),DCHECK,XP(c)
- S(h);S_CUTR(g)::R1(F),XP(f)
- Refutation
- P(c);XQ(A)
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- B(a);CHECK,OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
- S(h);S_CUTR(g)::R1(F),XP(f)
- Refutation
- P(b);
- Try
- P(G);XR(g)
- Threat
- R1(F),XP(f)
- Vars
- S(h);N_PINR(E),N_SPINP(f)::B(C)+R(E),DCHECK,XP(f)
- Refutation
- P(b);
- Try
- Actual
- Q(A);N_PINP(f),P_PINP(c)
- Threat
- QAR1(A),XP(c)
- Vars
- B(a);CHECK,OGATE,P_SPINB(a),XR(E)::B(C),XB(a)
- B(a);N_PINR(E),N_SPINP(c),P_SPINP(f),XQ(A)::B(C)+R(E),DCHECK,XP(f)
- B(a);N_SPINP(c),OGATE,P_SPINP(f)::QAR(A)
- S(h);N_PINR(E)::B(C)+R(E),DCHECK,XP(c)
- S(h);S_CUTR(g)::R1(F),XP(f)
- P(c);N_PINR(E)::B(C)+R(E),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).