MESON Chess Problem Database
Problem Display
PID: 54667 (1b3N2/2p1p2q/2N1Pp2/1RBr1k2/4p1pP/5rP1/2B5/1b2RQK1 w - - 0 1)
Mansfield, Comins
4th Comm., Europe Echecs, 1971
#2
11 + 11
| 4054 | Complete Mansfield/III | 1999 |
SOLUTION
- SOUND
- Sets
- 1...Rxf1+
- 2.Rxf1#
- 1...Rf2
- 2.Qxf2#
- 1...Rf4
- 2.Qxf4#
- 1...Rd1
- 2.Bd4#
- 1...Rd2
- 2.Bd4#
- 1...Rd3
- 2.Bd4#
- 1...Rd4
- 2.Bxd4#
- 1...Rxc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Rd6
- 2.Bxd6#
- 1...Rd7
- 2.Bd6#
- 1...Rd8
- 2.Bd6#
- 1...Ba2
- 2.Bxe4#
- 1...Rxf1+
- Tries
- 1.Bxb1?
- threat
- 2.Bxe4#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rd3
- 2.Bd4#
- 1...Rd4
- 2.Bxd4#
- 1...Re5
- 2.Sd4#
- 1...Qxh4!
- threat
- 1.Ba3?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- 1...Ba7+!
- threat
- 1.Be3?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2!
- threat
- 1.Bb4?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- 1...Ba7+!
- threat
- 1.Bd4?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Ba2
- 2.Bxe4#
- 1...Re5!
- threat
- 1.Bb6?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- 1...cxb6!
- threat
- 1.Bd6?
- threat
- 2.Sd4#
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Qxh4
- 2.Rxd5#
- 1...Rxb5
- 2.Sd4#
- 2.Qxb5#
- 1...cxd6
- 2.Rxd5#
- 1...exd6
- 2.Rxd5#
- 1...Rc5
- 2.Sd4#
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Sd4#
- 2.Bxe4#
- 1...Ba7+!
- threat
- 1.Ba7?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- 1...Bxa7+!
- threat
- 1.Bxe7?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxb5
- 2.Qxb5#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- 1...Ba7+!
- threat
- 1.Rd1?
- threat
- 2.Rxd5#
- 1...Rxf1+
- 2.Rxf1#
- 1...Rxd1
- 2.Bd4#
- 1...Rxc5
- 2.Rxc5#
- 1...Rd2
- 2.Bd4#
- 1...Rd3
- 2.Bd4#
- 1...Rd4
- 2.Bxd4#
- 1...Re5
- 2.Sd4#
- 1...Rd6
- 2.Bxd6#
- 1...Rd7
- 2.Bd6#
- 1...Rd8
- 2.Bd6#
- 1...Ba2!
- threat
- 1.Qc4?
- threat
- 2.Qxd5#
- 2.Qxe4#
- 1...Rf1+
- 2.Rxf1#
- 2.Qxf1#
- 1...Qxh4
- 2.Qxd5#
- 1...Rxc5
- 2.Rxc5#
- 2.Qxe4#
- 2.Qxc5#
- 1...Bxc2
- 2.Qxd5#
- 1...Ba2
- 2.Bxe4#
- 2.Qxe4#
- 1...Rfd3
- 2.Qxe4#
- 1...Re3
- 2.Qxd5#
- 1...Rf4
- 2.Qxd5#
- 1...Rd1
- 2.Bd4#
- 2.Qxe4#
- 1...Rd2
- 2.Bd4#
- 2.Qxe4#
- 1...Rdd3
- 2.Bd4#
- 2.Qxe4#
- 1...Rd4
- 2.Bxd4#
- 1...Re5
- 2.Sd4#
- 1...Rd6
- 2.Bxd6#
- 2.Qxe4#
- 1...Rd7
- 2.Bd6#
- 2.Qxe4#
- 1...Rd8
- 2.Bd6#
- 2.Qxe4#
- 1...Rxg3+!
- threat
- 1.Bxb1?
- Keys
- 1.Bf2!
- threat
- 2.Rxd5#
- 1...Rxg3+
- 2.Bxg3#
- 1...Rxb5
- 2.Qxb5#
- 1...Rd3
- 2.Be3#
- 1...Rc5
- 2.Rxc5#
- 1...Re5
- 2.Sd4#
- 1...Ba2
- 2.Bxe4#
- threat
- 1.Bf2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 10
- Sets
- R(b);CHECK,N_SPINR(b),OGATE,XQ(B)::R(A),XR(b)
- R(b);OGATEB::QAR(B),XR(b)
- R(b);OGATE::QAR1(B),XR(b)
- R(e);OGATEB::R(G)+B(H)
- R(e);N_SPINP(c),OGATEB::R(G)+B(H)
- R(e);OGATEB::R(G)+B(H),XR(e)
- R(e);OGATE,XB(H)::R(G),XR(e)
- R(e);N_GUARD,SBLOCK::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Tries
- Try
- B(D);XB(a)
- Threat
- B(D),XP(c)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,XQ(B)::R(A),XR(b)
- R(e);N_SPINP(c),OGATEB::R(G)+B(H)
- R(e);OGATEB::R(G)+B(H),XR(e)
- R(e);N_GUARD,SBLOCK::S(I)
- Refutation
- Q(j);XP(F)
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- B(k);CHECK
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- Refutation
- B(a);
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- B(k);CHECK
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- R(e);
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- P(h);XB(H)
- Try
- B(H);
- Threat
- DUALS(2)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- Q(j);XP(F)::R(G),XR(e)
- P(h);XB(H)::R(G),XR(e)
- P(i);XB(H)::R(G),XR(e)
- R(e);::S(I)
- Refutation
- B(k);CHECK
- Try
- B(H);
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- B(k);CHECK,XB(H)
- Try
- B(H);XP(i)
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,P_SPINR(e),XQ(B)::R(A),XR(b)
- R(e);OGATE,XR(G)::QAR(B),XR(e)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(c)
- Refutation
- B(k);CHECK
- Try
- R(A);
- Threat
- R(A),XR(e)
- Vars
- R(b);CHECK,N_SPINR(b),OGATE,XQ(B)::R(A),XR(b)
- R(e);OGATEB,P_PINQ(B),XR(A)::R(G)+B(H)
- R(e);OGATE,XB(H)::R(G),XR(e)
- R(e);OGATEB::R(G)+B(H)
- R(e);N_SPINP(c),OGATEB::R(G)+B(H)
- R(e);OGATEB::R(G)+B(H),XR(e)
- R(e);N_GUARD,SBLOCK::S(I)
- Refutation
- B(a);
- Try
- Q(B);N_PINR(b)
- Threat
- DUALS(2)
- Vars
- Q(j);XP(F)::QAR2(B),XR(e)
- B(a);N_SPINP(c),XB(D)::QAR2(B),XR(e)
- R(b);N_SPINP(c)::QAB1(B),XP(c)
- R(b);::QAR2(B),XR(e)
- R(e);OGATEB::R(G)+B(H),XR(e)
- R(e);N_GUARD,SBLOCK::S(I)
- Refutation
- R(b);CHECK,XP(E)
- Try
- Actual
- B(H);N_PINR(b),P_PINR(e)
- Threat
- R(G),XR(e)
- Vars
- R(b);CHECK,OGATE,XP(E)::QAR(B)+B(H),XR(b)
- R(e);N_SPINR(e),OGATE,XR(G)::QAR(B),XR(e)
- R(b);N_SPINP(c),OGATEB::QAR(B)+B(H)
- R(e);OGATEB::R(G),XR(e)
- R(e);::S(I)
- B(a);N_GUARD::B(D),XP(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).