MESON Chess Problem Database

Problem Display
PID: 51534 (3n4/3Q4/K2N2p1/b1pk1pR1/1p2p3/4P2p/b1P4B/8 w - - 0 1)

Brotherton, David WA

The Guardian, 1963

3n4/3Q4/K2N2p1/b1pk1pR1/1p2p3/4P2p/b1P4B/8

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bc4+
      • 2.Sb5#
    • 1...Sc6
      • 2.Qf7#
    • 1...Se6
      • 2.Qb7#
    • 1...b3
      • 2.c4#
    • 1...c4
      • 2.Sb7#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Sc4#
        • 2.Sxf5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Bc4+
        • 2.Sxc4#
      • 1...Sb7
        • 2.Sxb7#
        • 2.Qf7#
      • 1...Sf7
        • 2.Sxf7#
        • 2.Qxf7#
      • 1...c4
        • 2.Sxc4#
        • 2.Sxf5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Bc7!
    • 1.Sxe4+?
      • 1...Kc4
        • 2.Qd3#
      • 1...Kxe4!
    • 1.Rg2?
      • threat
        • 2.Rd2#
      • 1...Bc4+
        • 2.Sb5#
      • 1...c4
        • 2.Sb7#
      • 1...f4
        • 2.Rg5#
      • 1...Sc6
        • 2.Qf7#
      • 1...Se6
        • 2.Qb7#
      • 1...b3
        • 2.c4#
      • 1...hxg2!
    • 1.Qb7+?
      • 1...Ke6
        • 2.Rxg6#
      • 1...Sc6
        • 2.Qf7#
      • 1...Sxb7!
    • 1.c4+?
      • 1...Bxc4+
        • 2.Sb5#
      • 1...bxc4 ep!
  • Keys
    • 1.Rg1!
      • threat
        • 2.Rd1#
      • 1...Bc4+
        • 2.Sb5#
      • 1...c4
        • 2.Sb7#
      • 1...f4
        • 2.Rg5#
      • 1...Sc6
        • 2.Qf7#
      • 1...Se6
        • 2.Qb7#
      • 1...b3
        • 2.c4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(a);CHECK,SBLOCK::QAR(G)+S(F)
    • S(j);N_GUARD,SBLOCK::QAB(G)
    • P(c);N_GUARD,S_CUTB(a)::P(A)
    • P(f);SBLOCK::QAR(G)+S(F)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • DUALS(6)
      • Vars
        • B(a);CHECK::QAR(G)+S(F),XB(a)
      • Refutation
        • B(e);
    • Try
      • S(F);CHECK,XP(d)
      • Vars
        • K(g);N_SPINP(h),OGATE,S_FLIGHT::QAB1(G)
      • Refutation
        • K(g);N_SPINP(h),S_FLIGHT,XS(F)
    • Try
      • R(D);N_PINP(h)
      • Threat
        • R(D)
      • Vars
        • B(a);CHECK,SBLOCK::QAR(G)+S(F)
        • P(f);SBLOCK::QAR(G)+S(F)
        • P(h);OGATEB::R(D)
        • S(j);N_GUARD,SBLOCK::QAB(G)
        • P(c);N_GUARD,S_CUTB(a)::P(A)
      • Refutation
        • P(b);XR(D)
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);N_SPINP(h),S_FLIGHT::R(D),XP(i)
        • S(j);N_GUARD,P_SPINS(j),SBLOCK::QAB(G)
      • Refutation
        • S(j);XQ(G)
    • Try
      • P(A);CHECK
      • Vars
        • B(a);CHECK,SBLOCK,XP(A)::QAR(G)+S(F)
      • Refutation
        • P(c);EP,XP(A)
  • Actual
    • R(D);N_PINP(h)
    • Threat
      • R(D)
    • Vars
      • B(a);CHECK,SBLOCK::QAR(G)+S(F)
      • P(f);SBLOCK::QAR(G)+S(F)
      • P(h);OGATEB::R(D)
      • S(j);N_GUARD,SBLOCK::QAB(G)
      • P(c);N_GUARD,S_CUTB(a)::P(A)
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