MESON Chess Problem Database
Problem Display
PID: 2897 (8/8/2Np2p1/N2p2P1/3P1p2/Qbpk1B2/4RP2/4K3 w - - 0 1)
Reira, Pedro
Source?, 1904
#2
9 + 7
| 2681 | All Change Here! | 1919 |
| 3530 | Het Half Pin Thema (II) | 1947 |
SOLUTION
- SOUND
- Sets
- 1...Bd1
- 2.Rd2#
- 1...Ba2
- 2.Rd2#
- 1...Bc2
- 2.Rd2#
- 1...Ba4
- 2.Rd2#
- 1...Bc4
- 2.Rd2#
- 1...c2
- 2.Qxb3#
- 1...Bd1
- Tries
- 1.Sxb3?
- threat
- 2.Qa6#
- 1...c2
- 2.Sd2#
- 2.Sba5#
- 1...Kc4!
- threat
- 1.Se5+?
- 1...Kxd4
- 2.Sxb3#
- 2.Sac6#
- 1...dxe5!
- 1...Kxd4
- 1.Bh1?
- 1...c2
- 2.Qxb3#
- 1...Ba2
- 2.Rd2#
- 1...Bd1
- 2.Rd2#
- 1...Bc2
- 2.Rd2#
- 1...Ba4
- 2.Rd2#
- 1...Bc4
- 2.Rd2#
- 1...f3!
- 1...c2
- 1.Bg2?
- 1...c2
- 2.Qxb3#
- 1...Ba2
- 2.Rd2#
- 1...Bd1
- 2.Rd2#
- 1...Bc2
- 2.Rd2#
- 1...Ba4
- 2.Rd2#
- 1...Bc4
- 2.Rd2#
- 1...f3!
- 1...c2
- 1.Bxd5?
- threat
- 2.Be4#
- 1...c2
- 2.Qxb3#
- 1...Bxd5!
- threat
- 1.Bh5?
- threat
- 2.Bxg6#
- 1...c2
- 2.Qxb3#
- 1...gxh5!
- threat
- 1.Rb2?
- 1...cxb2
- 2.Qxb3#
- 1...c2
- 2.Rxb3#
- 2.Qxb3#
- 1...Ba2
- 2.Rd2#
- 1...Bd1
- 2.Rd2#
- 1...Ba4
- 2.Rd2#
- 1...Bc4
- 2.Rd2#
- 1...Bc2!
- 1...cxb2
- 1.Qc1?
- 1...c2
- 2.Qd2#
- 1...Ba2
- 2.Qd1#
- 2.Qc2#
- 1...Bd1
- 2.Qxd1#
- 1...Bc2
- 2.Qxc2#
- 1...Bc4
- 2.Qd1#
- 2.Qc2#
- 1...Ba4!
- 1...c2
- 1.Qa4?
- 1...c2
- 2.Qxb3#
- 1...Ba2
- 2.Qd1#
- 2.Qc2#
- 1...Bd1
- 2.Qxd1#
- 2.Qb5#
- 1...Bc2
- 2.Qxc2#
- 2.Qb5#
- 1...Bc4
- 2.Qd1#
- 2.Qc2#
- 1...Bxa4!
- 1...c2
- 1.Sxb3?
- Keys
- 1.Sc4!
- 1...Kxc4
- 2.Qa6#
- 1...Bxc4
- 2.Rd2#
- 1...dxc4
- 2.Be4#
- 1...c2
- 2.Qxb3#
- 1...Bd1
- 2.Sb2#
- 1...Ba2
- 2.Sb2#
- 1...Bc2
- 2.Sb2#
- 1...Ba4
- 2.Sb2#
- 1...Kxc4
- 1.Sc4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- B(a);P_SPINP(b)::R1(B)
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- Tries
- Try
- S(G);XB(a)
- Threat
- QAB(D)
- Refutation
- K(c);S_FLIGHT
- Try
- S(I);CHECK
- Refutation
- P(f);XS(I)
- Try
- B(E);
- Vars
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- B(a);P_SPINP(b)::R1(B)
- Refutation
- P(d);
- Try
- B(E);
- Vars
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- B(a);P_SPINP(b)::R1(B)
- Refutation
- P(d);
- Try
- B(E);XP(e)
- Threat
- B(E)
- Vars
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- Refutation
- B(a);P_SPINP(b),XB(E)
- Try
- B(E);
- Threat
- B(E),XP(g)
- Vars
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- Refutation
- P(g);XB(E)
- Try
- R(B);
- Vars
- P(b);OGATEB,P_SPINB(a),XR(B)::QAR2(D),XB(a)
- B(a);P_SPINP(b)::R1(B)
- Refutation
- B(a);P_SPINP(b)
- Try
- Q(D);
- Vars
- P(b);N_GUARD::QAR1(D)
- B(a);N_GUARD::QAR2(D),XB(a)
- B(a);N_GUARD::QAB1(D),XB(a)
- Refutation
- B(a);
- Try
- Q(D);
- Vars
- P(b);OGATEB::QAR2(D),XB(a)
- Refutation
- B(a);XQ(D)
- Try
- Actual
- S(G);
- Vars
- K(c);OGATEB,S_FLIGHT,XS(G)::QAB(D)
- B(a);P_SPINP(b),SBLOCK,XS(G)::R1(B)
- P(e);N_GUARD,SBLOCK,XS(G)::B(E)
- P(b);OGATEB,P_SPINB(a)::QAR2(D),XB(a)
- B(a);P_SPINP(b)::S(G)
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).