MESON Chess Problem Database

Problem Display
PID: 2919 (2N5/p2Bp1n1/p5P1/P1pk2K1/3p2N1/8/4Q3/8 w - - 0 1)

Williams, Philip Hamilton

Chess Amateur (The), 1909

2N5/p2Bp1n1/p5P1/P1pk2K1/3p2N1/8/4Q3/8

#2

7 + 7

2681 All Change Here! 1919

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qe6#
    • 1...Sh5
      • 2.Qe6#
    • 1...Se6+
      • 2.Qxe6#
    • 1...Se8
      • 2.Qe6#
    • 1...d3
      • 2.Qxd3#
    • 1...c4
      • 2.Qe5#
    • 1...e5
      • 2.Sf6#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Kh4?
      • 1...d3
        • 2.Qxd3#
      • 1...c4
        • 2.Qe5#
      • 1...Sh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#
      • 1...Sf5+!
    • 1.Kh6?
      • 1...d3
        • 2.Qxd3#
      • 1...c4
        • 2.Qe5#
      • 1...Sh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#
      • 1...Sf5+!
    • 1.Sb6+?
      • 1...Kd6
        • 2.Qe5#
      • 1...axb6!
    • 1.Sd6?
      • threat
        • 2.Qe5#
      • 1...Se6+
        • 2.Qxe6#
      • 1...exd6
        • 2.Sf6#
      • 1...e5
        • 2.Qxe5#
      • 1...Kxd6!
    • 1.Qc4+?
      • 1...Ke4
        • 2.Bc6#
      • 1...Kxc4!
  • Keys
    • 1.Qxa6!
      • 1...Se6+
        • 2.Qxe6#
      • 1...Ke4
        • 2.Bc6#
      • 1...d3
        • 2.Qxd3#
      • 1...c4
        • 2.Qc6#
      • 1...e5
        • 2.Sf6#
      • 1...Sf5
        • 2.Qe6#
      • 1...Sh5
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#
      • 1...e6
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(g);N_GUARD::QAB1(A)
    • S(g);CHECK,N_GUARD::QAB1(A),XS(g)
    • P(a);OGATEB::QAR2(A),XP(a)
    • P(b);SBLOCK::QAR1(A)
    • P(f);N_GUARD::S(B)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(b);SBLOCK::QAR1(A)
        • S(g);N_GUARD::QAB1(A)
        • S(g);N_GUARD::QAB1(A),XS(g)
        • P(f);N_GUARD::S(B)
      • Refutation
        • S(g);CHECK
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(b);SBLOCK::QAR1(A)
        • S(g);N_GUARD::QAB1(A)
        • S(g);N_GUARD::QAB1(A),XS(g)
        • P(f);N_GUARD::S(B)
      • Refutation
        • S(g);CHECK
    • Try
      • S(G);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(A)
      • Refutation
        • P(e);XS(G)
    • Try
      • S(G);
      • Threat
        • QAR1(A)
      • Vars
        • S(g);CHECK,N_GUARD::QAB1(A),XS(g)
        • P(f);N_GUARD,SBLOCK,XS(G)::S(B)
        • P(f);::QAR1(A),XP(f)
      • Refutation
        • K(c);P-FLIGHT,XS(G)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT::B(F)
      • Refutation
        • K(c);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);XP(d)
    • Vars
      • S(g);CHECK,N_GUARD::QAB1(A),XS(g)
      • K(c);S_FLIGHT::B(F)
      • P(a);OGATEB::QAR2(A),XP(a)
      • P(b);::QAB1(A)
      • P(f);N_GUARD,SBLOCK::S(B)
      • S(g);N_GUARD::QAB1(A)
      • P(f);SBLOCK::B(F)
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