MESON Chess Problem Database

Problem Display
PID: 21074 (2Q5/r2ppprN/2N1k1bR/q1p5/6P1/b2pK3/3P1P1B/4R2B w - - 0 1)

Ellerman, Arnoldo

1st HM., Good Companions (December), 1916

2Q5/r2ppprN/2N1k1bR/q1p5/6P1/b2pK3/3P1P1B/4R2B

#2

11 + 11

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2+
      • 2.Kxd2#
    • 1...Qc3
      • 2.Sd8#
    • 1...Qb4
      • 2.Sd8#
    • 1...Qd8
      • 2.Sxd8#
    • 1...Qa4
      • 2.Sd8#
    • 1...Qb5
      • 2.Sd8#
    • 1...Qa6
      • 2.Sd8#
    • 1...Rc7
      • 2.Sd8#
    • 1...c4
      • 2.Sd4#
  • Tries
    • 1.Rxg6+?
      • 1...Rxg6
        • 2.Kxd3#
      • 1...f6
        • 2.Sg5#
      • 1...fxg6!
    • 1.Qc7?
      • threat
        • 2.Kf4#
        • 2.Sd8#
        • 2.Qe5#
      • 1...Qxd2+
        • 2.Kxd2#
      • 1...Rxc7
        • 2.Sd8#
      • 1...Rxh7
        • 2.Qe5#
      • 1...dxc6
        • 2.Kf4#
        • 2.Qxc6#
      • 1...f5
        • 2.Sd8#
      • 1...f6
        • 2.Sd8#
      • 1...Qc3
        • 2.Sd8#
      • 1...Qb4
        • 2.Sd8#
        • 2.Qe5#
      • 1...Qa4
        • 2.Sd8#
        • 2.Qe5#
      • 1...Ra8
        • 2.Kf4#
        • 2.Qe5#
      • 1...Rg8
        • 2.Kf4#
        • 2.Qe5#
      • 1...Bb2
        • 2.Sd8#
      • 1...c4
        • 2.Sd4#
        • 2.Sd8#
      • 1...d5
        • 2.Kf3#
        • 2.Kf4#
        • 2.Sd8#
      • 1...d6
        • 2.Kf4#
        • 2.Sd8#
      • 1...Qxc7!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxe7#
      • 1...Qxd2+
        • 2.Kxd2#
      • 1...dxc6
        • 2.Qxc6#
      • 1...Qd8
        • 2.Sxd8#
      • 1...c4
        • 2.Sd4#
      • 1...d5
        • 2.Kf3#
      • 1...d6
        • 2.Kf4#
      • 1...f5
        • 2.Kxd3#
      • 1...f6
        • 2.Sf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(c);CHECK,XP(C)::R(A)+K(F),XQ(c)
    • Q(c);N_GUARD::S(H)
    • Q(c);N_GUARD::S(H),XQ(c)
    • R(g);S_CUTQ(c)::S(H)
    • P(d);N_GUARD::S(H)
  • Tries
    • Try
      • R(I);CHECK,XB(f)
      • Vars
        • R(k);XR(I)::R(A)+K(F),XP(b)
        • P(j);N_SPINP(h),P_SPINP(j)::S(J)
      • Refutation
        • P(j);XR(I)
    • Try
      • Q(K);N_PINP(h)
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);CHECK,XP(C)::R(A)+K(F),XQ(c)
        • R(g);XQ(K)::S(H)
        • R(k);XS(J)::QAR1(K)
        • P(j);::S(H)
        • P(j);N_SPINB(f)::S(H)
        • Q(c);::S(H)
        • B(a);::S(H)
      • Refutation
        • Q(c);XQ(K)
  • Actual
    • Q(K);N_PINP(h),P_PINP(i)
    • Threat
      • QAR1(K),XP(i)
    • Vars
      • Q(c);CHECK,XP(C)::R(A)+K(F),XQ(c)
      • P(h);OGATE,XS(H)::QAR2(K),XP(h)
      • Q(c);N_GUARD::S(H),XQ(c)
      • P(d);N_GUARD::S(H)
      • P(h);SBLOCK::R(A)+K(F)
      • P(j);::R(A)+K(F),XP(b)
      • P(j);N_SPINB(f),SBLOCK::S(J)
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