MESON Chess Problem Database

Problem Display
PID: 21941 (8/1p6/1P2R3/2kp4/1r1N4/BPN5/pnK5/Q7 w - - 0 1)

Hume, George

3rd Prize, Good Companions (April Complete Blocks), 1922

8/1p6/1P2R3/2kp4/1r1N4/BPN5/pnK5/Q7

#2

8 + 6

3132 The Good Companion Two-Mover 1922
3348 Changing Fashions 1925

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qg1#
    • 1...Sd1
      • 2.Sa4#
    • 1...Sd3
      • 2.Sa4#
    • 1...Sa4
      • 2.Sxa4#
    • 1...Sc4
      • 2.Sa4#
  • Tries
    • 1.Kd2?
      • 1...Kxd4
        • 2.Qg1#
      • 1...Sd1
        • 2.Sa4#
      • 1...Sd3
        • 2.Sa4#
      • 1...Sa4
        • 2.Sxa4#
      • 1...Sc4+!
    • 1.Sa4+?
      • 1...Kxd4
        • 2.Bxb2#
        • 2.Qxb2#
        • 2.Qg1#
      • 1...Sxa4!
    • 1.Se4+?
      • 1...Kxd4
        • 2.Qg1#
      • 1...dxe4!
    • 1.Bxb4+?
      • 1...Kxd4
        • 2.Se2#
        • 2.Sb5#
        • 2.Qg1#
      • 1...Kxb4!
    • 1.Rf6?
      • 1...Sd1
        • 2.Sa4#
      • 1...Sd3
        • 2.Sa4#
      • 1...Sa4
        • 2.Sxa4#
      • 1...Sc4
        • 2.Sa4#
      • 1...Kxd4!
    • 1.Rg6?
      • 1...Sd1
        • 2.Sa4#
      • 1...Sd3
        • 2.Sa4#
      • 1...Sa4
        • 2.Sxa4#
      • 1...Sc4
        • 2.Sa4#
      • 1...Kxd4!
    • 1.Rh6?
      • 1...Sd1
        • 2.Sa4#
      • 1...Sd3
        • 2.Sa4#
      • 1...Sa4
        • 2.Sxa4#
      • 1...Sc4
        • 2.Sa4#
      • 1...Kxd4!
    • 1.Qxb2?
      • threat
        • 2.Sa4#
      • 1...Kxd4
        • 2.Sa4#
      • 1...a1S+!
    • 1.Qh1?
      • threat
        • 2.Qxd5#
      • 1...Kxd4
        • 2.Qxd5#
        • 2.Qg1#
      • 1...a1S+!
  • Keys
    • 1.Sxa2!
      • 1...Kxd4
        • 2.Qg1#
      • 1...Sd1
        • 2.Bxb4#
      • 1...Sd3
        • 2.Qc3#
      • 1...Sa4
        • 2.Bxb4#
      • 1...Sc4
        • 2.Bxb4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINR(c),OGATEB,S_FLIGHT,XS(F)::QAB(A)
    • S(b);N_GUARD::S(E)
    • S(b);N_GUARD::S(E),XS(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(d);N_SPINR(c),OGATEB,S_FLIGHT,XS(F)::QAB(A)
        • S(b);N_GUARD::S(E)
        • S(b);N_GUARD::S(E),XS(b)
      • Refutation
        • S(b);CHECK
    • Try
      • S(E);CHECK
      • Refutation
        • S(b);XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • K(d);N_SPINR(c),P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
      • Refutation
        • P(e);XS(E)
    • Try
      • B(C);CHECK,XR(c)
      • Refutation
        • K(d);S_FLIGHT,XB(C)
    • Try
      • R(H);
      • Vars
        • S(b);N_GUARD::S(E)
        • S(b);N_GUARD::S(E),XS(b)
      • Refutation
        • K(d);N_SPINR(c),S_FLIGHT,XS(F)
    • Try
      • R(H);
      • Vars
        • S(b);N_GUARD::S(E)
        • S(b);N_GUARD::S(E),XS(b)
      • Refutation
        • K(d);N_SPINR(c),S_FLIGHT,XS(F)
    • Try
      • R(H);
      • Vars
        • S(b);N_GUARD::S(E)
        • S(b);N_GUARD::S(E),XS(b)
      • Refutation
        • K(d);N_SPINR(c),S_FLIGHT,XS(F)
    • Try
      • Q(A);XS(b)
      • Threat
        • S(E)
      • Vars
        • K(d);N_SPINR(c),S_FLIGHT,XS(F)::QAB(A)+S(E)
      • Refutation
        • P(a);CHECK
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(e)
      • Refutation
        • P(a);CHECK
  • Actual
    • S(E);XP(a)
    • Vars
      • K(d);N_SPINR(c),OGATEB,P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
      • S(b);::B(C),XR(c)
      • S(b);OGATE::QAR2(A)
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