MESON Chess Problem Database

Problem Display
PID: 263871 (8/4nBp1/2b1N3/4b1Rp/Rn1pk1p1/4N3/2P2P2/3Q3K w - - 0 1)

Maas, Johann H

2nd Comm., Tijdschrift vd NSB, 1928

8/4nBp1/2b1N3/4b1Rp/Rn1pk1p1/4N3/2P2P2/3Q3K

#2

9 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Sc5#
    • 1...Sd3
      • 2.cxd3#
    • 1...Sd5
      • 2.Bg6#
    • 1...Sg6
      • 2.Bxg6#
    • 1...Sc8
      • 2.Bg6#
    • 1...Sg8
      • 2.Bg6#
    • 1...d3
      • 2.cxd3#
  • Tries
    • 1.Bg6+?
      • 1...Sf5
        • 2.Bxf5#
      • 1...Sxg6!
    • 1.Rf5?
      • threat
        • 2.Sc5#
        • 2.Sg5#
      • 1...dxe3
        • 2.Qd3#
      • 1...Sd3
        • 2.Sg5#
        • 2.Qxd3#
        • 2.cxd3#
      • 1...Bf4
        • 2.Sc5#
      • 1...Bd6
        • 2.Sg5#
        • 2.Qxd4#
      • 1...Bf6
        • 2.Sc5#
      • 1...Sa6
        • 2.Sg5#
        • 2.Qd3#
      • 1...d3
        • 2.Qxd3#
        • 2.cxd3#
      • 1...g5
        • 2.Sc5#
        • 2.Sxg5#
      • 1...Sxf5!
    • 1.Qxg4+?
      • 1...Bf4
        • 2.Sc5#
        • 2.Qg2#
        • 2.Qxf4#
      • 1...hxg4!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sc5#
      • 1...Kxd5
        • 2.Qxd4#
      • 1...Bxd5
        • 2.Qe2#
      • 1...Sbxd5
        • 2.Qd3#
      • 1...Sexd5
        • 2.Bg6#
      • 1...Sd3
        • 2.Sc3#
      • 1...Bd6
        • 2.Qe2#
      • 1...Sa6
        • 2.Sc3#
      • 1...d3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • B(e);SBLOCK::S(H)
    • S(a);OGATE,P_SPINP(b)::P(C),XS(a)
    • S(h);N_GUARD::B(I)
    • S(h);N_GUARD::B(I),XS(h)
    • P(b);OGATE,P_SPINS(a)::P(C),XP(b)
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::B(I),XS(h)
      • Refutation
        • S(h);XB(I)
    • Try
      • R(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);P_SPINS(a),XS(E)::QAB1(A)
        • B(e);::S(H)
      • Refutation
        • S(h);XR(G)
    • Try
      • Q(A);CHECK,XP(d)
      • Refutation
        • P(f);XQ(A)
  • Actual
    • S(E);
    • Threat
      • S(H)
    • Vars
      • K(c);N_GUARD,P_SPINB(e),P_SPINP(b),S_FLIGHT,XS(E)::QAR1(A),XP(b)
      • B(g);SBLOCK,XS(E)::QAR2(A)
      • S(a);N_GUARD,P_SPINP(b),SBLOCK,XS(E)::QAB1(A)
      • S(h);N_GUARD,SBLOCK,XS(E)::B(I)
      • S(a);P_SPINP(b)::S(E)
      • B(e);::QAR2(A)
      • P(b);P_SPINS(a)::QAB1(A),XP(b)
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