MESON Chess Problem Database

Problem Display
PID: 161289 (2Q5/3pp3/3pN1K1/1n1kb3/1P1BRP2/3R4/5N2/8 w - - 0 1)

Evans, TC

The Observer, 1922

(First published on Sun Oct 15 1922)

2Q5/3pp3/3pN1K1/1n1kb3/1P1BRP2/3R4/5N2/8

#2

9 + 6

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.Qg8#
    • 1...Bxf4
      • 2.Sxf4#
  • Tries
    • 1.Bxe5+?
      • 1...Kxe6
        • 2.Ba1#
        • 2.Bb2#
        • 2.Bc3#
        • 2.Bxd6#
        • 2.Bf6#
        • 2.Bg7#
        • 2.Bh8#
        • 2.Qg8#
        • 2.f5#
      • 1...Sd4!
    • 1.Rc3?
      • threat
        • 2.Qc4#
      • 1...Kxe6
        • 2.Qg8#
      • 1...Sa3
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sxc3!
    • 1.Qb7+?
      • 1...Kxe6
        • 2.f5#
      • 1...Kc4!
    • 1.Qc5+?
      • 1...Kxe6
        • 2.f5#
      • 1...dxc5!
    • 1.Qa8+?
      • 1...Kxe6
        • 2.Qg8#
        • 2.f5#
      • 1...Kc4!
  • Keys
    • 1.Qa6!
      • 1...Kc4
        • 2.Bxe5#
      • 1...Kxe6
        • 2.Rxe5#
      • 1...Bxd4
        • 2.Qxb5#
      • 1...Bxf4
        • 2.Qxb5#
      • 1...Sxd4
        • 2.Sc7#
      • 1...dxe6
        • 2.Qxb5#
      • 1...Bf6
        • 2.Qxb5#
      • 1...Bg7
        • 2.Qxb5#
      • 1...Bh8
        • 2.Qxb5#
      • 1...Sa3
        • 2.Sc7#
      • 1...Sc3
        • 2.Sc7#
      • 1...Sa7
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,P_SPINB(c),P_SPINP(e),S_FLIGHT,XS(G)::QAB(I)
    • B(c);XP(F)::S(G),XB(c)
  • Tries
    • Try
      • B(D);CHECK,XB(c)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • R(B);
      • Threat
        • QAB1(I)
      • Vars
        • K(b);OGATEB,P_SPINB(c),P_SPINP(e),S_FLIGHT,XS(G)::QAB(I)
        • S(a);N_GUARD::S(G)
        • S(a);N_GUARD::S(G),XS(a)
      • Refutation
        • S(a);XR(B)
    • Try
      • Q(I);CHECK
      • Vars
        • K(b);P_SPINB(c),S_FLIGHT,XS(G)::P(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • K(b);P_SPINB(c),S_FLIGHT,XS(G)::P(F)
      • Refutation
        • P(d);XQ(I)
    • Try
      • Q(I);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(I);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::R(E)+B(D),XB(c)
      • K(b);P_SPINB(c),P_SPINP(d),S_FLIGHT,XS(G)::R1(E),XB(c)
      • B(c);P_SPINB(c),XB(D)::QAR2(I),XS(a)
      • B(c);XP(F)::QAR2(I),XS(a)
      • S(a);N_GUARD,P_SPINS(a),XB(D)::S(G)
      • P(e);SBLOCK,XS(G)::QAR2(I),XS(a)
      • B(c);::QAR2(I),XS(a)
      • S(a);N_GUARD::S(G)
      • S(a);N_GUARD::S(G),XS(a)
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