MESON Chess Problem Database

Problem Display
PID: 136539 (nB5N/2r1p2K/8/2b1kpQN/2P4R/2pp4/8/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1918

nB5N/2r1p2K/8/2b1kpQN/2P4R/2pp4/8/8

#2

7 + 8

6490 yacpdb 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Qxe7#
    • 1...Bf2
      • 2.Qxe7#
    • 1...Be3
      • 2.Qxe7#
    • 1...Bd4
      • 2.Qxe7#
    • 1...Bb6
      • 2.Qxe7#
    • 1...Bd6
      • 2.Qe3#
    • 1...Ba7
      • 2.Qxe7#
    • 1...e6+
      • 2.Sf7#
  • Tries
    • 1.Re4+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...Kd6!
    • 1.Qg2?
      • threat
        • 2.Qd5#
      • 1...e6+
        • 2.Sf7#
      • 1...Kd6
        • 2.Qd5#
      • 1...Ke6
        • 2.Qd5#
      • 1...Sb6!
    • 1.Qxf5+?
      • 1...Kd6
        • 2.Qd5#
      • 1...Kxf5!
    • 1.Qg8?
      • threat
        • 2.Qd5#
      • 1...e6+
        • 2.Sf7#
      • 1...Kd6
        • 2.Qd5#
      • 1...Sb6!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Qe3#
      • 1...e6+
        • 2.Qg7#
      • 1...Kxd4
        • 2.Qf4#
      • 1...Ke6
        • 2.Qe3#
      • 1...Bxd4
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • B(c);N_GUARD::QAR2(C),XP(g)
    • B(c);N_GUARD,N_SPINR(f),SBLOCK::QAR2(C)
    • P(g);CHECK,SBLOCK::S(G)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(d);N_SPINP(e),N_SPINR(f),P-FLIGHT,XR(B)::QAR1(C)
      • Refutation
        • K(d);N_SPINP(e),S_FLIGHT
    • Try
      • Q(C);N_PINP(e)
      • Threat
        • QAR1(C)
      • Vars
        • P(g);CHECK,SBLOCK::S(G)
        • K(d);S_FLIGHT::QAR1(C)
        • K(d);N_SPINR(f),P-FLIGHT::QAB1(C)
      • Refutation
        • S(h);
    • Try
      • Q(C);CHECK,XP(e)
      • Vars
        • K(d);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(d);N_SPINR(f),P-FLIGHT,XQ(C)
    • Try
      • Q(C);N_PINP(e)
      • Threat
        • QAR1(C)
      • Vars
        • P(g);CHECK,SBLOCK::S(G)
        • K(d);S_FLIGHT::QAR1(C)
      • Refutation
        • S(h);
  • Actual
    • R(B);
    • Threat
      • QAR2(C)
    • Vars
      • P(g);CHECK,SBLOCK::QAB(C)
      • K(d);N_SPINP(e),N_SPINR(f),S_FLIGHT,XR(B)::QAR2(C)
      • K(d);N_SPINP(e),N_SPINR(f),P-FLIGHT::QAR(C)
      • B(c);N_GUARD,SBLOCK,XR(B)::QAR2(C),XP(g)
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