MESON Chess Problem Database

Problem Display
PID: 51169 (1K1Bbr1n/2NpR3/3k2p1/pp1P2P1/N7/n7/8/1Q6 w - - 0 1)

Stewart, John

Stubbs, Arthur Goodwin

Manchester Guardian, 1952

1K1Bbr1n/2NpR3/3k2p1/pp1P2P1/N7/n7/8/1Q6

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sf7
      • 2.Qxg6#
    • 1...bxa4
      • 2.Qb6#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Se4#
        • 2.Sb7#
      • 1...Rf4
        • 2.Sb7#
      • 1...Kxc5!
    • 1.Sxb5+?
      • 1...Kxd5
        • 2.Qe4#
      • 1...Sxb5!
    • 1.Sxe8+?
      • 1...Kxd5
        • 2.Qe4#
      • 1...Rxe8!
    • 1.Qe4?
      • threat
        • 2.Qe5#
      • 1...Rf5
        • 2.Sxe8#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sf7
        • 2.Qxg6#
      • 1...bxa4!
    • 1.Qg1?
      • threat
        • 2.Qc5#
        • 2.Qb6#
      • 1...bxa4
        • 2.Qb6#
      • 1...Sc4
        • 2.Qc5#
      • 1...Rf2!
    • 1.Qxb5?
      • threat
        • 2.Qa6#
        • 2.Qc5#
        • 2.Qb6#
      • 1...Sc4
        • 2.Qc5#
      • 1...Sxb5!
  • Keys
    • 1.Qd3!
      • 1...bxa4
        • 2.Qxa3#
      • 1...Rf1
        • 2.Sxe8#
      • 1...Rf2
        • 2.Sxe8#
      • 1...Rf3
        • 2.Sxe8#
      • 1...Rf4
        • 2.Sxe8#
      • 1...Rf5
        • 2.Sxe8#
      • 1...Rf6
        • 2.Sxe8#
      • 1...Rf7
        • 2.Sxe8#
      • 1...Rg8
        • 2.Qg3#
      • 1...Bf7
        • 2.Qg3#
      • 1...Sb1
        • 2.Sxb5#
      • 1...Sc2
        • 2.Sxb5#
      • 1...Sc4
        • 2.Sxb5#
      • 1...Sf7
        • 2.Qxg6#
      • 1...b4
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • S(i);N_GUARD,S_CUTB(g),S_CUTR(h)::QAR(A),XP(e)
    • P(c);OGATE,XS(B)::QAR2(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(h);::S(B)
      • Refutation
        • K(d);S_FLIGHT,XS(B)
    • Try
      • S(E);CHECK,XP(c)
      • Vars
        • K(d);P-FLIGHT,XP(C)::QAB1(A)
      • Refutation
        • S(a);XS(E)
    • Try
      • S(E);CHECK,XB(g)
      • Vars
        • K(d);P-FLIGHT,XP(C)::QAB1(A)
      • Refutation
        • R(h);P_PINB(H),XS(E)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(h);N_GUARD::S(E),XB(g)
        • S(a);N_GUARD::S(E),XP(c)
        • S(i);N_GUARD,S_CUTB(g),S_CUTR(h)::QAR(A),XP(e)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XS(B)::QAR2(A)
        • S(a);::QAB1(A)
      • Refutation
        • R(h);
    • Try
      • Q(A);XP(c)
      • Threat
        • DUALS(3)
      • Vars
        • S(a);::QAB1(A)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • P(c);N_GUARD,XS(B)::QAB(A),XS(a)
      • R(h);N_GUARD::S(E),XB(g)
      • R(h);N_GUARD::QAB(A)
      • B(g);P_PINB(H),S_CUTR(h)::QAB(A)
      • S(a);N_GUARD::S(E),XP(c)
      • S(i);N_GUARD,S_CUTB(g),S_CUTR(h)::QAR(A),XP(e)
      • P(c);OGATE::QAR(A)
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