MESON Chess Problem Database

Problem Display
PID: 21217 (4rn2/2p1r1q1/2RN1bp1/1PNk4/R7/1Kp4B/6PB/7Q w - - 0 1)

Ellerman, Arnoldo

Good Companions (July), 1917

4rn2/2p1r1q1/2RN1bp1/1PNk4/R7/1Kp4B/6PB/7Q

#2

10 + 9

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Qd1#
    • 1...Be5
      • 2.g3#
      • 2.g4#
    • 1...Se6
      • 2.g4#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Rc5#
      • 1...cxd6
        • 2.Rxd6#
      • 1...Re5
        • 2.Sf4#
      • 1...Bd4
        • 2.Sb4#
      • 1...Be5
        • 2.g3#
      • 1...Se6
        • 2.g3#
        • 2.g4#
      • 1...Sd7!
    • 1.Be6+?
      • 1...Sxe6
        • 2.g4#
      • 1...Rxe6!
    • 1.g3+?
      • 1...Ke5
        • 2.Sd3#
        • 2.Qe4#
        • 2.g4#
      • 1...Re4!
  • Keys
    • 1.Sa6!
      • threat
        • 2.Rc5#
      • 1...cxd6
        • 2.Rxd6#
      • 1...Re5
        • 2.Qd1#
      • 1...Bd4
        • 2.Sb4#
      • 1...Be5
        • 2.g3#
      • 1...Se6
        • 2.g4#
      • 1...Sd7
        • 2.Sxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(f);S_CUTB(c)::QAR(A)
    • S(i);S_CUTR(f)::QAB(A)+P(B)
  • Tries
    • Try
      • S(H);
      • Threat
        • R1(I)
      • Vars
        • P(e);OGATE,XS(J)::R1(I),XP(e)
        • R(f);SBLOCK::S(H)
        • B(c);SBLOCK::S(H)
        • B(c);S_CUTR(f)::QAB(A)+P(B)
      • Refutation
        • S(i);
    • Try
      • B(E);CHECK
      • Vars
        • S(i);XB(E)::QAB(A)+P(B)
      • Refutation
        • R(f);XB(E)
    • Try
      • P(B);CHECK
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • S(H);
    • Threat
      • R1(I)
    • Vars
      • P(e);OGATE,XS(J)::R1(I),XP(e)
      • R(f);S_CUTB(c)::QAR(A)
      • B(c);SBLOCK::S(H)
      • B(c);SBLOCK,S_CUTR(f)::QAB(A)+P(B)
      • S(i);SBLOCK,S_CUTR(f)::QAB(A)+P(B)
      • S(i);S_CUTR(f)::S(H),XP(e)
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