MESON Chess Problem Database

Problem Display
PID: 51143 (N3R3/3p4/rp1k4/B1p5/2p4p/3pPBpP/6K1/1Q6 w - - 0 1)

Andrade, Barry Jack da Costa

Manchester Guardian, 1951

N3R3/3p4/rp1k4/B1p5/2p4p/3pPBpP/6K1/1Q6

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa5
      • 2.Qxb6#
    • 1...Ra7
      • 2.Qxb6#
    • 1...Rxa8
      • 2.Qxb6#
    • 1...d2
      • 2.Qg6#
    • 1...c3
      • 2.Qxd3#
    • 1...bxa5
      • 2.Qb8#
    • 1...b5
      • 2.Bc7#
  • Tries
    • 1.Kf1?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...bxa5
        • 2.Qb8#
      • 1...Ra7
        • 2.Qxb6#
      • 1...d2
        • 2.Qg6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5
        • 2.Bc7#
      • 1...g2+!
    • 1.Kg1?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...bxa5
        • 2.Qb8#
      • 1...Ra7
        • 2.Qxb6#
      • 1...d2
        • 2.Qg6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5
        • 2.Bc7#
      • 1...g2!
    • 1.Kh1?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...bxa5
        • 2.Qb8#
      • 1...Ra7
        • 2.Qxb6#
      • 1...d2
        • 2.Qg6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5
        • 2.Bc7#
      • 1...g2+!
    • 1.Sc7?
      • threat
        • 2.Sb5#
      • 1...Rxa5
        • 2.Qxb6#
      • 1...b5
        • 2.Sxb5#
      • 1...Kxc7!
    • 1.Be4?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...bxa5
        • 2.Qb8#
      • 1...Ra7
        • 2.Qxb6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5
        • 2.Bc7#
      • 1...d2!
    • 1.Bb7?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...Ra7
        • 2.Qxb6#
      • 1...d2
        • 2.Qg6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5
        • 2.Bc7#
      • 1...bxa5!
    • 1.Bd2?
      • 1...Rxa8
        • 2.Qxb6#
      • 1...Ra1
        • 2.Qxb6#
      • 1...Ra2
        • 2.Qxb6#
      • 1...Ra3
        • 2.Qxb6#
      • 1...Ra4
        • 2.Qxb6#
      • 1...Ra5
        • 2.Qxb6#
      • 1...Ra7
        • 2.Qxb6#
      • 1...c3
        • 2.Qxd3#
      • 1...b5!
    • 1.Qa1?
      • threat
        • 2.Qe5#
        • 2.Qf6#
      • 1...Rxa8
        • 2.Qe5#
      • 1...c3!
    • 1.Qb2?
      • threat
        • 2.Qe5#
        • 2.Qf6#
      • 1...Rxa8
        • 2.Qe5#
        • 2.Qxb6#
      • 1...c3!
    • 1.Qb5?
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...bxa5
        • 2.Qxa6#
        • 2.Qb8#
      • 1...Ra7
        • 2.Qxb6#
      • 1...c3
        • 2.Qxd3#
      • 1...d2!
    • 1.e4?
      • threat
        • 2.e5#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...Kc6!
  • Keys
    • 1.Qb4!
      • 1...Rxa5
        • 2.Qxb6#
      • 1...Rxa8
        • 2.Qxb6#
      • 1...cxb4
        • 2.Bxb4#
      • 1...bxa5
        • 2.Qb8#
      • 1...d2
        • 2.Qxd2#
      • 1...Ra7
        • 2.Qxb6#
      • 1...c3
        • 2.Qf4#
      • 1...b5
        • 2.Bc7#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
    • R(f);N_GUARD::QAR2(A),XP(g)
    • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
    • P(a);OGATE::QAR(A)
    • P(c);N_GUARD::QAR(A),XP(a)
    • P(g);OGATE,XB(F)::QAB(A)
    • P(g);OGATE::B(F)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • P(g);OGATE,XB(F)::QAB(A)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(a);OGATE::QAR(A)
        • P(c);N_GUARD::QAR(A),XP(a)
        • P(g);OGATE::B(F)
      • Refutation
        • P(b);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • P(g);OGATE,XB(F)::QAB(A)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(a);OGATE::QAR(A)
        • P(c);N_GUARD::QAR(A),XP(a)
        • P(g);OGATE::B(F)
      • Refutation
        • P(b);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • P(g);OGATE,XB(F)::QAB(A)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(a);OGATE::QAR(A)
        • P(c);N_GUARD::QAR(A),XP(a)
        • P(g);OGATE::B(F)
      • Refutation
        • P(b);CHECK
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • P(g);::S(G),XP(g)
      • Refutation
        • K(h);P_SPINP(g),S_FLIGHT,XS(G)
    • Try
      • B(D);
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • P(g);OGATE,XB(F)::QAB(A)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(c);N_GUARD::QAR(A),XP(a)
        • P(g);OGATE::B(F)
      • Refutation
        • P(a);
    • Try
      • B(D);
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(a);OGATE::QAR(A)
        • P(c);N_GUARD::QAR(A),XP(a)
        • P(g);OGATE::B(F)
      • Refutation
        • P(g);XB(F)
    • Try
      • B(F);
      • Vars
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • R(f);N_GUARD,P_PINB(F)::QAR2(A),XP(g)
        • P(c);N_GUARD::QAR(A),XP(a)
      • Refutation
        • P(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XS(G)::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Vars
        • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
        • R(f);N_GUARD::QAR2(A),XP(g)
        • P(c);OGATE::QAR(A),XP(a)
      • Refutation
        • P(a);
    • Try
      • P(C);
      • Threat
        • P(C)
      • Vars
        • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
      • Refutation
        • K(h);P-FLIGHT
  • Actual
    • Q(A);P_PINP(e)
    • Vars
      • R(f);N_GUARD,XB(F)::QAR2(A),XP(g)
      • R(f);N_GUARD,XS(G)::QAR2(A),XP(g)
      • P(e);N_SPINP(e),OGATE,XQ(A)::B(F),XP(e)
      • P(g);OGATE,XB(F)::QAB(A)
      • P(a);OGATEB::QAR(A),XP(a)
      • R(f);N_GUARD::QAR2(A),XP(g)
      • P(c);OGATE::QAB(A)
      • P(g);OGATE::B(F)
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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).