MESON Chess Problem Database

Problem Display
PID: 21106 (4R3/2rp3b/3pB2r/N3k1P1/K2nNqP1/2PP3p/7B/7Q w - - 0 1)

Ellerman, Arnoldo

1st Prize, Good Companions (October), 1916

4R3/2rp3b/3pB2r/N3k1P1/K2nNqP1/2PP3p/7B/7Q

#2

11 + 9

3132 The Good Companion Two-Mover 1922
3360 Simple Two-move Themes 1924
3364 Solving in Style 1985
133 The Problemist Supplement 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh2
      • 2.Qxh2#
    • 1...Qg3
      • 2.Bxg3#
    • 1...Rc4+
      • 2.Sxc4#
    • 1...Rb7
      • 2.Sc4#
    • 1...Bxe4
      • 2.Qxe4#
    • 1...Sc6
      • 2.Sc4#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Sc4#
        • 2.Qd5#
      • 1...Sc2+
        • 2.Sc4#
      • 1...Se2+
        • 2.Sc4#
      • 1...Sb3+
        • 2.Sc4#
      • 1...Sf3+
        • 2.Sc4#
      • 1...Sb5+
        • 2.Sc4#
      • 1...Sf5+
        • 2.Sc4#
        • 2.Qe4#
      • 1...Sc6+
        • 2.Sc4#
      • 1...Sxe6+
        • 2.Sc4#
        • 2.d4#
      • 1...Qxh2
        • 2.Qxh2#
      • 1...Rxe6
        • 2.Sc4#
      • 1...Bxd3
        • 2.Sxd3#
        • 2.Qd5#
      • 1...dxe6
        • 2.Sc4#
      • 1...Qg3
        • 2.Bxg3#
      • 1...d5
        • 2.Qxd5#
      • 1...Ra7
        • 2.Qd5#
      • 1...Be4
        • 2.Sc4#
        • 2.Qxe4#
      • 1...Rxc5!
    • 1.Ba2+?
      • 1...Se6
        • 2.d4#
      • 1...Re6!
    • 1.Bb3+?
      • 1...Se6
        • 2.d4#
      • 1...Re6!
    • 1.Bc4+?
      • 1...Se6
        • 2.d4#
      • 1...Re6!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Qd5#
      • 1...Rc4+
        • 2.Sxc4#
      • 1...Sc2+
        • 2.Bc4#
      • 1...Se2+
        • 2.Bc4#
      • 1...Sb3+
        • 2.Bc4#
      • 1...Sf3+
        • 2.Bc4#
      • 1...Sb5+
        • 2.Bc4#
      • 1...Sf5+
        • 2.Qe4#
      • 1...Sc6+
        • 2.Sc4#
      • 1...Sxe6+
        • 2.d4#
      • 1...Qxh2
        • 2.Qxh2#
      • 1...Qg3
        • 2.Bxg3#
      • 1...d5
        • 2.Qxd5#
      • 1...Rc5
        • 2.Sxd7#
      • 1...Be4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_SPINQ(c),OGATE,XB(B)::QAB(A),XQ(c)
    • Q(c);OGATEB::B(B),XQ(c)
    • R(g);CHECK,N_GUARD::S(H),XR(g)
    • R(g);N_GUARD::S(H)
    • B(i);OGATE,XS(F)::QAR1(A),XB(i)
    • S(b);P_PINS(F),S_CUTR(g)::S(H)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);CHECK::S(H)
        • Q(c);N_SPINQ(c),OGATE,XB(B)::QAB(A),XQ(c)
        • R(f);P_SPINR(f),XB(J)::S(H)
        • P(h);P_SPINP(h),XB(J)::S(H)
        • Q(c);OGATEB::B(B),XQ(c)
        • P(e);::QAR1(A),XP(e)
        • R(g);P_PINS(H)::QAR1(A)
      • Refutation
        • R(g);XS(F)
    • Try
      • B(J);CHECK
      • Vars
        • S(b);OGATE,P_PINS(F),P_SPINS(b)::P(D)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • B(J);CHECK
      • Vars
        • S(b);OGATE,P_PINS(F),P_SPINS(b)::P(D)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • B(J);CHECK
      • Vars
        • S(b);OGATE,P_SPINS(b)::P(D)
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • S(F);
    • Threat
      • QAR1(A)
    • Vars
      • R(g);CHECK,N_GUARD::S(H),XR(g)
      • S(b);CHECK,N_GUARD::R(K)+B(J)
      • S(b);CHECK,S_CUTB(i)::QAR1(A)
      • S(b);CHECK,S_CUTR(g)::S(H)
      • S(b);CHECK,OGATE,P_SPINS(b),XB(J)::P(D)
      • Q(c);N_SPINQ(c),OGATE,XB(B)::QAB(A),XQ(c)
      • Q(c);OGATEB::B(B),XQ(c)
      • P(e);::QAR1(A),XP(e)
      • R(g);N_GUARD::S(F),XP(h)
      • B(i);N_GUARD::QAR1(A),XB(i)
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