MESON Chess Problem Database

Problem Display
PID: 225173 (7B/7B/2rpp2p/N2k4/3pN3/b1p3Q1/8/1n5K w - - 0 1)

Coutinho, Jose Ernesto

US Problem Bulletin, 1967

7B/7B/2rpp2p/N2k4/3pN3/b1p3Q1/8/1n5K

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Sf6#
      • 2.Qxd6#
    • 1...Bc5
      • 2.Sf6#
    • 1...d3
      • 2.Qxd3#
    • 1...e5
      • 2.Qg8#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qxd4#
      • 1...e5
        • 2.Qf7#
      • 1...Bc5
        • 2.Qa2#
      • 1...d3
        • 2.Qd4#
      • 1...Rc4!
    • 1.Qg5+?
      • 1...e5
        • 2.Qg8#
      • 1...hxg5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxd4#
      • 1...e5
        • 2.Bg8#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Bc5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(b);SBLOCK::S(C)
    • P(d);OGATEB::QAR2(B),XP(d)
    • P(h);OGATEB::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(d)
      • Vars
        • P(h);OGATEB::QAB(B)
        • B(b);S_CUTR(f)::QAB(B)
        • P(d);::QAR1(B)
      • Refutation
        • R(f);
    • Try
      • Q(B);CHECK
      • Vars
        • P(h);OGATEB,P_SPINP(h)::QAB(B)
      • Refutation
        • P(i);XQ(B)
  • Actual
    • Q(B);P_PINP(d)
    • Threat
      • QAR1(B),XP(d)
    • Vars
      • P(h);OGATEB::B(E)
      • R(f);N_GUARD::QAB1(B),XR(f)
      • B(b);S_CUTR(f)::QAB1(B)
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