MESON Chess Problem Database

Problem Display
PID: 81289 (B6R/B7/n7/8/5Pp1/R4q1N/P5k1/1KQ2N2 w - - 0 1)

Macleod, Norman Alasdair

Die Schwalbe, 1964

B6R/B7/n7/8/5Pp1/R4q1N/P5k1/1KQ2N2

#2

10 + 4

6455 The Chessboard Adventures of Norman Macleod 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Bxe4#
    • 1...Qd5
      • 2.Bxd5#
    • 1...Qc6
      • 2.Bxc6#
    • 1...Qb7+
      • 2.Bxb7#
    • 1...gxh3
      • 2.Bxf3#
    • 1...g3
      • 2.Bxf3#
  • Tries
    • 1.Se3+?
      • 1...Kh2
        • 2.Qg1#
      • 1...Kg3!
    • 1.Sg1?
      • threat
        • 2.Rh2#
      • 1...Qe4+
        • 2.Bxe4#
      • 1...Qb7+
        • 2.Bxb7#
      • 1...g3
        • 2.Bxf3#
      • 1...Sc5!
    • 1.Sg5?
      • threat
        • 2.Rh2#
      • 1...Qe4+
        • 2.Bxe4#
      • 1...Qb7+
        • 2.Bxb7#
      • 1...g3
        • 2.Bxf3#
      • 1...Sc5!
    • 1.Rxf3?
      • threat
        • 2.Rf2#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Re3#
        • 2.Rg3#
      • 1...Kh1
        • 2.Rf2#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Re3#
        • 2.Rg3#
      • 1...gxh3
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Rg3#
        • 2.Rfxh3#
      • 1...Sb4
        • 2.Rf2#
        • 2.Rg3#
      • 1...Sc5
        • 2.Rf2#
        • 2.Rg3#
      • 1...Sc7
        • 2.Rf2#
        • 2.Rg3#
      • 1...Sb8
        • 2.Rf2#
        • 2.Rg3#
      • 1...g3
        • 2.Rf2#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Re3#
        • 2.Rxg3#
      • 1...gxf3!
    • 1.Qb2+?
      • 1...Kh1
        • 2.Sg3#
        • 2.Sg1#
        • 2.Sg5#
        • 2.Qh2#
      • 1...Kxf1!
    • 1.Qd2+?
      • 1...Kh1
        • 2.Sg3#
        • 2.Sg1#
        • 2.Sg5#
        • 2.Qh2#
      • 1...Kxf1!
    • 1.Qc2+?
      • 1...Kh1
        • 2.Sg3#
        • 2.Sg1#
        • 2.Sg5#
        • 2.Qh2#
      • 1...Kxf1!
    • 1.f5?
      • threat
        • 2.Sf4#
      • 1...Qe4+
        • 2.Bxe4#
      • 1...Qb7+
        • 2.Bxb7#
      • 1...Kh1
        • 2.Sf4#
      • 1...gxh3
        • 2.Bxf3#
      • 1...Sc5!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qg1#
      • 1...Qe4+
        • 2.Qc2#
      • 1...Qb7+
        • 2.Qb2#
      • 1...Kh2
        • 2.Qg1#
      • 1...Kxg3
        • 2.Qg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(b);CHECK,OGATEB::B(I),XQ(b)
    • Q(b);OGATEB::B(I),XQ(b)
    • P(c);N_GUARD,XS(F)::B(I),XQ(b)
    • P(c);N_GUARD::B(I),XQ(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);N_SPINQ(b),P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);N_SPINQ(b),P-FLIGHT
    • Try
      • S(F);
      • Threat
        • R1(J)
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • S(d);
    • Try
      • S(F);
      • Threat
        • R1(J)
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • P(c);N_GUARD::B(I),XQ(b)
      • Refutation
        • S(d);
    • Try
      • R(E);XQ(b)
      • Threat
        • DUALS(7)
      • Refutation
        • P(c);P_SPINP(c),XR(E)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);N_SPINQ(b),S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);N_SPINQ(b),S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);N_SPINQ(b),S_FLIGHT,XS(C)
    • Try
      • P(G);
      • Threat
        • S(F)
      • Vars
        • Q(b);CHECK,OGATEB::B(I),XQ(b)
        • K(a);S_FLIGHT::R(J)+S(F)
        • P(c);N_GUARD,XS(F)::B(I),XQ(b)
      • Refutation
        • S(d);
  • Actual
    • S(C);
    • Threat
      • QAR1(B)
    • Vars
      • Q(b);CHECK::QAR(B)
      • K(a);N_SPINQ(b),P-FLIGHT::QAB1(B)
      • K(a);P-FLIGHT,XS(C)::QAR2(B)
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