MESON Chess Problem Database

Problem Display
PID: 39173 (nn1B3b/3p3r/3kp3/1R1PN3/r7/p1Q5/8/2KR4 w - - 0 1)

Isenegger, Samuel

Basellandschaftliche Zeitung, 1929

nn1B3b/3p3r/3kp3/1R1PN3/r7/p1Q5/8/2KR4

#2

7 + 9

56 The Problemist 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Sxc4#
    • 1...Ra5
      • 2.Sc4#
    • 1...Ra6
      • 2.Sc4#
    • 1...Ra7
      • 2.Sc4#
    • 1...Rh1
      • 2.Sf7#
    • 1...Rh2
      • 2.Sf7#
    • 1...Rh3
      • 2.Sf7#
    • 1...Rh4
      • 2.Sf7#
    • 1...Rh5
      • 2.Sf7#
    • 1...Rh6
      • 2.Sf7#
    • 1...Rf7
      • 2.Sxf7#
    • 1...Bxe5
      • 2.Qc5#
    • 1...Bg7
      • 2.Sf7#
    • 1...Sb6
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
  • Tries
    • 1.Rb6+?
      • 1...Sxb6
        • 2.Qc7#
      • 1...Sc6!
    • 1.Qb4+?
      • 1...Kxe5
        • 2.d6#
      • 1...Rxb4!
    • 1.Qxa3+?
      • 1...Rxa3
        • 2.Sc4#
      • 1...Rb4
        • 2.Sc4#
      • 1...Kxe5!
  • Keys
    • 1.Qc4!
      • threat
        • 2.dxe6#
      • 1...Rxc4+
        • 2.Sxc4#
      • 1...Kxe5
        • 2.d6#
      • 1...Bxe5
        • 2.Qc5#
      • 1...exd5
        • 2.Qxd5#
      • 1...Rh1
        • 2.Sf7#
      • 1...Rh2
        • 2.Sf7#
      • 1...Rh3
        • 2.Sf7#
      • 1...Rh4
        • 2.Sf7#
      • 1...Sb6
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#
      • 1...Sc6
        • 2.dxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(b);N_GUARD,P_PINQ(C)::S(F),XR(b)
    • R(b);N_GUARD::S(F)
    • R(f);N_GUARD,P_PINR(B)::S(F)
    • R(f);N_GUARD::S(F)
    • R(f);N_GUARD::S(F),XR(f)
    • B(i);SBLOCK,XS(F)::QAB1(C)
    • B(i);S_CUTR(f)::S(F)
    • S(g);N_GUARD::QAB1(C)
    • S(g);N_GUARD::QAB1(C),XS(g)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(g);XR(D)::QAB1(C)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT,XS(F)::R(D)+P(E)
      • Refutation
        • R(b);XQ(C)
    • Try
      • Q(C);CHECK,XP(a)
      • Vars
        • R(b);XQ(C)::S(F)
        • R(b);P_SPINR(b)::S(F)
      • Refutation
        • K(c);S_FLIGHT,XS(F)
  • Actual
    • Q(C);
    • Threat
      • R(B)+P(E),XP(d)
    • Vars
      • R(b);CHECK,XQ(C)::S(F),XR(b)
      • K(c);OGATE,S_FLIGHT,XS(F)::R(D)+P(E)
      • B(i);SBLOCK,XS(F)::QAB1(C)
      • P(d);OGATE,P_SPINP(d),XP(E)::QAR1(C),XP(d)
      • R(f);N_GUARD,P_PINR(B)::S(F)
      • R(f);N_GUARD::S(F)
      • S(g);N_GUARD::QAB1(C)
      • S(g);N_GUARD::QAB1(C),XS(g)
      • S(h);OGATE::R(B)+P(E),XS(h)
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