MESON Chess Problem Database

Problem Display
PID: 178781 (2B5/8/8/3P4/2P1k1N1/4Pb2/2P3N1/1Q2n1K1 w - - 0 1)

Overkamp, Petrus

1st HM., Springaren, 1953

2B5/8/8/3P4/2P1k1N1/4Pb2/2P3N1/1Q2n1K1

#2

9 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Qxc2#
    • 1...Sxg2
      • 2.c3#
    • 1...Sd3
      • 2.cxd3#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qe7#
        • 2.Qh7#
        • 2.d6#
      • 1...Bxg2
        • 2.d6#
      • 1...Sxc2
        • 2.Qh7#
      • 1...Bd1
        • 2.d6#
      • 1...Be2
        • 2.d6#
      • 1...Sd3
        • 2.Qh7#
        • 2.d6#
      • 1...Bxg4!
    • 1.c3+?
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sd3!
    • 1.d6?
      • threat
        • 2.Qb7#
      • 1...Sxc2
        • 2.Qxc2#
      • 1...Bxg4!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Sf2#
        • 2.Sf6#
        • 2.Qf4#
        • 2.Qe5#
      • 1...Bxg2
        • 2.Qf4#
      • 1...Bxg4
        • 2.Qf4#
      • 1...Sxc2
        • 2.Sf2#
      • 1...Sxg2
        • 2.Qe5#
      • 1...Bd1
        • 2.Qf4#
      • 1...Be2
        • 2.Qf4#
      • 1...Sd3
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE,P_SPINS(a),XP(C)::QAB(A),XS(a)
    • S(a);N_GUARD,XS(D)::QAB(A)+P(C)
    • S(a);OGATE::P(C),XS(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(b);XS(D)::QAB(A)+P(H)
        • S(a);XP(C)::QAB(A)
        • B(b);::QAB(A)+P(H)
      • Refutation
        • B(b);XS(G)
    • Try
      • P(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • P(H);
      • Threat
        • QAB(A)
      • Vars
        • S(a);OGATE,P_SPINS(a),XP(C)::QAB(A),XS(a)
      • Refutation
        • B(b);XS(G)
  • Actual
    • Q(A);
    • Threat
      • DUALS(4)
    • Vars
      • B(b);XS(D)::QAR1(A)
      • B(b);XS(G)::QAR1(A)
      • S(a);XP(C)::S(G)
      • S(a);XS(D)::QAR1(A)
      • B(b);::QAR1(A)
      • S(a);::S(G)
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