MESON Chess Problem Database

Problem Display
PID: 65317 (8/8/8/4Rp1Q/BppN2q1/1r4P1/1B3RKp/3k4 w - - 0 1)

Ellerman, Arnoldo

van der Ven, AMA

Good Companions (May), 1922

8/8/8/4Rp1Q/BppN2q1/1r4P1/1B3RKp/3k4

#2

8 + 7

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Qxe2#
    • 1...Qf3+
      • 2.Qxf3#
    • 1...h1Q+
      • 2.Qxh1#
    • 1...h1S
      • 2.Qxh1#
    • 1...h1B+
      • 2.Qxh1#
    • 1...h1R
      • 2.Qxh1#
  • Tries
    • 1.Sxb3?
      • threat
        • 2.Rd2#
      • 1...Qf3+
        • 2.Qxf3#
      • 1...h1Q+
        • 2.Qxh1#
      • 1...h1B+
        • 2.Qxh1#
      • 1...cxb3
        • 2.Bxb3#
      • 1...Qe2
        • 2.Qxe2#
      • 1...c3!
    • 1.Sxf5?
      • threat
        • 2.Qxg4#
      • 1...Qf3+
        • 2.Qxf3#
      • 1...h1Q+
        • 2.Qxh1#
      • 1...h1B+
        • 2.Qxh1#
      • 1...Qe2
        • 2.Qxe2#
      • 1...Qxh5!
  • Keys
    • 1.Rd5!
      • 1...Qf3+
        • 2.Sxf3#
      • 1...h1Q+
        • 2.Qxh1#
      • 1...h1B+
        • 2.Qxh1#
      • 1...Ke1
        • 2.Sc2#
      • 1...Qxh5
        • 2.Sf3#
      • 1...Qe2
        • 2.Qxe2#
      • 1...h1S
        • 2.Qxh1#
      • 1...h1R
        • 2.Qxh1#
      • 1...c3
        • 2.Sc2#
      • 1...f4
        • 2.Sf3#

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_PINP(D),OGATE,P_PINR(B)::QAB1(H),XQ(f)
    • Q(f);CHECK,N_PINP(D),OGATE::QAB(H),XQ(f)
    • P(b);CHECK,OGATE::QAR(H),XQ(b)
    • P(b);OGATE::QAR(H),XS(b)
    • P(b);CHECK,OGATE::QAR(H),XB(b)
    • P(b);OGATE::QAR(H),XR(b)
  • Tries
    • Try
      • S(F);XR(c)
      • Threat
        • R1(B)
      • Vars
        • Q(f);CHECK,N_PINP(D),OGATE::QAB(H),XQ(f)
        • P(b);CHECK,OGATE::QAR(H),XQ(b)
        • P(b);CHECK,OGATE::QAR(H),XB(b)
        • P(e);OGATE,P_SPINP(e),XS(F)::B(E),XP(e)
        • Q(f);N_PINP(D),OGATE,P_PINR(B)::QAB1(H),XQ(f)
      • Refutation
        • P(e);
    • Try
      • S(F);XP(g)
      • Threat
        • QAB(H),XQ(f)
      • Vars
        • Q(f);CHECK,N_PINP(D),OGATE::QAB(H),XQ(f)
        • P(b);CHECK,OGATE::QAR(H),XQ(b)
        • P(b);CHECK,OGATE::QAR(H),XB(b)
        • Q(f);N_PINP(D),OGATE,P_PINR(B)::QAB1(H),XQ(f)
      • Refutation
        • Q(f);N_PINP(D),N_SPINQ(f),XQ(H)
  • Actual
    • R(G);
    • Vars
      • Q(f);CHECK,N_GUARD,N_PINP(D)::R(G)+S(F),XQ(f)
      • P(b);CHECK,OGATE::QAR(H),XQ(b)
      • P(b);CHECK,OGATE::QAR(H),XB(b)
      • K(a);N_SPINQ(f),N_SPINR(c),P-FLIGHT::S(F)
      • Q(f);N_GUARD,N_PINP(D),N_SPINQ(f),XQ(H)::R(G)+S(F)
      • Q(f);N_PINP(D),OGATE,P_PINR(B)::QAB1(H),XQ(f)
      • P(b);OGATE::QAR(H),XS(b)
      • P(b);OGATE::QAR(H),XR(b)
      • P(e);::R(G)+S(F)
      • P(g);::R(G)+S(F)
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