MESON Chess Problem Database

Problem Display
PID: 138953 (3br3/7B/5PnK/2p2b1R/1N1Bk1p1/2QpPr2/1P4P1/1q6 w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1918

3br3/7B/5PnK/2p2b1R/1N1Bk1p1/2QpPr2/1P4P1/1q6

#2

10 + 10

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qxd3#
    • 1...Qa1
      • 2.Qxd3#
    • 1...Qc1
      • 2.Qxd3#
    • 1...Qe1
      • 2.Qxd3#
    • 1...Qg1
      • 2.Qxd3#
    • 1...Qh1
      • 2.Qxd3#
    • 1...Qxb2
      • 2.Qxd3#
    • 1...Be6
      • 2.Re5#
    • 1...Sf4
      • 2.Bxf5#
    • 1...cxb4
      • 2.Qc6#
    • 1...cxd4
      • 2.Qxd4#
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qd5#
      • 1...Rxe3
        • 2.Bc3#
      • 1...cxb4
        • 2.Qc6#
      • 1...cxd4
        • 2.Qxd4#
      • 1...Qa2
        • 2.Qxd3#
      • 1...Re5
        • 2.Bxc5#
      • 1...Be6
        • 2.Re5#
      • 1...Sf4
        • 2.Bxf5#
      • 1...Se7
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::QAB1(C),XP(b)
    • Q(a);N_GUARD,P_PINP(D)::QAB1(C),XP(b)
    • Q(a);N_GUARD,P_PINR(G)::QAB1(C),XP(b)
    • Q(a);N_GUARD,XP(A)::QAB1(C),XP(b)
    • B(g);OGATE,P_SPINS(h)::R1(G)
    • S(h);OGATE,P_SPINB(g)::B(J),XB(g)
    • P(f);OGATE,XS(E)::QAB(C)
    • P(f);OGATE,XB(F)::QAR1(C),XP(f)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • R(c);SBLOCK,XP(D)::QAR(C)+B(F)
      • P(f);OGATE,XS(E)::QAB(C)
      • P(f);OGATE,P_SPINP(f),XB(F)::QAR1(C),XP(f)
      • Q(a);N_GUARD::QAB1(C),XP(b)
      • R(j);SBLOCK::QAR(C)+B(F),XP(f)
      • B(g);OGATE,P_SPINS(h)::R1(G)
      • S(h);OGATE,P_SPINB(g)::B(J),XB(g)
      • S(h);N_GUARD,P_SPINB(g),S_CUTR(j)::QAR2(C)
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