MESON Chess Problem Database

Problem Display
PID: 88249 (8/8/8/5n2/1N2k3/2Q2R1K/2Nrp3/8 w - - 0 1)

de Blasio, Francis JC

American Chess Problemist, 1950

8/8/8/5n2/1N2k3/2Q2R1K/2Nrp3/8

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Qxe3#
    • 1...Sg3
      • 2.Qe3#
    • 1...Sd4
      • 2.Qe3#
    • 1...Sh4
      • 2.Qe3#
    • 1...Sd6
      • 2.Qe3#
    • 1...Sh6
      • 2.Qe3#
    • 1...Se7
      • 2.Qe3#
    • 1...Sg7
      • 2.Qe3#
  • Tries
    • 1.Rxf5?
      • threat
        • 2.Qe5#
        • 2.Qf3#
      • 1...Rd3+
        • 2.Qxd3#
      • 1...Rxc2
        • 2.Qe5#
        • 2.Qd3#
      • 1...e1S
        • 2.Qe5#
      • 1...Rd4
        • 2.Qf3#
      • 1...Rd5
        • 2.Qf3#
      • 1...Kxf5!
    • 1.Qe5+?
      • 1...Kxf3
        • 2.Qxf5#
      • 1...Kxe5!
    • 1.Qc6+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Ke5!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxf5#
      • 1...Kxf3
        • 2.Qxf5#
      • 1...Rxc2
        • 2.Qd5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sg3
        • 2.Qe3#
      • 1...Sd4
        • 2.Qd5#
      • 1...Sh4
        • 2.Qe3#
      • 1...Sd6
        • 2.Qe3#
      • 1...Sh6
        • 2.Qe3#
      • 1...Se7
        • 2.Qe3#
      • 1...Sg7
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAR1(B),XS(d)
    • S(d);N_GUARD::QAR1(B)
  • Tries
    • Try
      • R(C);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,N_GUARD::QAB1(B),XR(a)
        • P(b);::QAR1(B)
        • R(a);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAR2(B),XS(d)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(B),XR(a)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XS(d)
    • Vars
      • K(c);S_FLIGHT,XR(C)::QAR2(B),XS(d)
      • R(a);N_GUARD,XS(A)::QAB1(B)
      • R(a);N_GUARD::QAB1(B),XR(a)
      • S(d);N_GUARD::QAR1(B),XS(d)
      • S(d);N_GUARD::QAR1(B)
      • S(d);S_CUTR(a)::QAB1(B)
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