MESON Chess Problem Database

Problem Display
PID: 40824 (8/K3p3/3P4/1p2kpP1/3Rpp2/1B3b2/1Q4nr/B4nq1 w - - 0 1)

Ellerman, Arnoldo

1st HM., Good Companions (December), 1915

8/K3p3/3P4/1p2kpP1/3Rpp2/1B3b2/1Q4nr/B4nq1

#2

7 + 11

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Qxd4#
    • 1...Qh1
      • 2.Rd1#
      • 2.Rd2#
      • 2.Rd3#
    • 1...Sfe3
      • 2.Rd1#
      • 2.Rd2#
      • 2.Rd3#
    • 1...Sge3
      • 2.Rd2#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qc5#
      • 1...Sfe3
        • 2.Rd1#
      • 1...Sge3
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd3#
      • 1...e3
        • 2.Rd1#
        • 2.Rd2#
      • 1...exd6!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qc5#
      • 1...exd6
        • 2.Qxd6#
      • 1...Sfe3
        • 2.Rd1#
      • 1...Sge3
        • 2.Rd2#
      • 1...e3
        • 2.Ra4#
      • 1...b4
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XR(D)::QAB1(B),XQ(b)
    • S(c);N_PINR(D)::QAB(B)+R(D)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • S(a);N_PINR(D)::B(A)+R(D)
      • Refutation
        • P(k);XP(F)
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • P(k);OGATE,XP(F)::QAB1(B),XP(k)
      • S(a);N_PINR(D)::B(A)+R(D)
      • S(c);N_PINR(D)::B(A)+R(D)
      • P(f);N_PINR(D)::B(A)+R(D)
      • P(h);OGATEB::QAR(B)
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