MESON Chess Problem Database

Problem Display
PID: 230775 (4R3/1p1BQKp1/1P1N2p1/1p1k1pR1/bP2Nn2/1r1p1P2/3n4/b5B1 w - - 0 1)

Croes, Govert Aliander

Haring, Jacobus

The Problemist, 1988

4R3/1p1BQKp1/1P1N2p1/1p1k1pR1/bP2Nn2/1r1p1P2/3n4/b5B1

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Sc3#
      • 2.Qe5#
    • 1...Rc3
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Sxe4
      • 2.fxe4#
    • 1...Se2
      • 2.Qe6#
    • 1...Sg2
      • 2.Qe6#
    • 1...Sh3
      • 2.Qe6#
    • 1...Sh5
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
  • Tries
    • 1.Sc3+?
      • 1...Rxc3
        • 2.Qe5#
      • 1...Bxc3!
    • 1.Sc4?
      • threat
        • 2.Qc5#
      • 1...Kxc4
        • 2.Qc5#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Se6
        • 2.Qxe6#
      • 1...Bd4!
    • 1.Bxb5?
      • threat
        • 2.Qxb7#
      • 1...Sxe4
        • 2.fxe4#
      • 1...Se6
        • 2.Qxe6#
      • 1...Rc3
        • 2.Qe5#
      • 1...Bxb5!
    • 1.Bxf5?
      • threat
        • 2.Qxb7#
      • 1...Kc6
        • 2.Bd7#
        • 2.Qxb7#
      • 1...Sxe4
        • 2.Bxe4#
      • 1...Rc3
        • 2.Bd7#
      • 1...Se6!
    • 1.Bc6+?
      • 1...Kxc6
        • 2.Qxb7#
      • 1...bxc6!
    • 1.Rxf5+?
      • 1...Be5
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...gxf5!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Qc5#
      • 1...Kc4
        • 2.Qc5#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Se6
        • 2.Qxe6#
      • 1...Bd4
        • 2.Se3#
      • 1...Rc3
        • 2.Sfd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(c);S_CUTB(a)::QAR1(I)
    • B(a);N_GUARD,N_SPINP(i)::QAR1(I),XB(a)
    • S(b);OGATE,XS(D)::P(B),XS(b)
    • S(f);N_GUARD::QAB1(I)
    • S(f);N_GUARD::QAB1(I),XS(f)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • R(c);XS(D)::QAR1(I)
      • Refutation
        • B(a);XS(D)
    • Try
      • S(G);
      • Threat
        • QAR1(I)
      • Vars
        • K(h);N_SPINP(i),S_FLIGHT,XS(G)::QAR1(I)
        • S(b);OGATE,XS(D)::QAB1(I),XS(b)
        • S(f);N_GUARD::QAB1(I),XS(f)
      • Refutation
        • B(a);
    • Try
      • B(H);XP(g)
      • Threat
        • QAB(I),XP(k)
      • Vars
        • S(b);OGATE,XS(D)::P(B),XS(b)
        • S(f);N_GUARD::QAB1(I),XS(f)
        • R(c);S_CUTB(a)::QAR1(I)
      • Refutation
        • B(e);XB(H)
    • Try
      • B(H);XP(i)
      • Threat
        • QAB(I),XP(k)
      • Vars
        • S(b);OGATE,XS(D)::R(E)+B(H),DCHECK,XS(b)
        • R(c);S_CUTB(a)::R(E)+B(H)
      • Refutation
        • S(f);
    • Try
      • B(H);CHECK
      • Vars
        • K(h);N_SPINP(i),S_FLIGHT,XB(H)::QAB1(I),XP(k)
      • Refutation
        • P(k);XB(H)
    • Try
      • R(E);CHECK,XP(i)
      • Refutation
        • P(j);XR(E)
  • Actual
    • S(G);XP(i)
    • Threat
      • QAR1(I)
    • Vars
      • K(h);S_FLIGHT::QAR1(I)
      • S(b);OGATE,XS(D)::QAB1(I),XS(b)
      • S(f);N_GUARD::QAB1(I),XS(f)
      • B(a);SBLOCK::R(E)+S(G),DCHECK
      • R(c);S_CUTB(a)::R(E)+S(G)
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