MESON Chess Problem Database

Problem Display
PID: 2383 (B7/2Q5/K2NP3/p1P1kP1N/2r3r1/8/1R2PP2/B4b2 w - - 0 1)

Guidelli, Giorgio

Mari, Alberto

Good Companions (August), 1924

B7/2Q5/K2NP3/p1P1kP1N/2r3r1/8/1R2PP2/B4b2

#2

12 + 5

5454 Near Snap 2007
3713 Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Sb5#
      • 2.Rd2#
      • 2.Rb4#
    • 1...Rxc5
      • 2.Qxc5#
    • 1...Rd4
      • 2.Qg7#
    • 1...Re4
      • 2.Qg7#
    • 1...Rf4
      • 2.Qg7#
    • 1...Rh4
      • 2.Qg7#
    • 1...Rg7
      • 2.Qxg7#
    • 1...Bxe2
      • 2.Rxe2#
  • Tries
    • 1.Sxc4+?
      • 1...Kd4
        • 2.Rc2#
        • 2.Rb4#
      • 1...Kxf5!
    • 1.Se4+?
      • 1...Kd4
        • 2.Rd2#
        • 2.Rb4#
        • 2.Qd6#
      • 1...Kxf5!
    • 1.Sf7+?
      • 1...Kd4
        • 2.Rd2#
        • 2.Rb4#
        • 2.Qe5#
      • 1...Kxf5!
    • 1.Sc8+?
      • 1...Kd4
        • 2.Rd2#
        • 2.Rb4#
      • 1...Kxf5!
    • 1.Se8+?
      • 1...Kd4
        • 2.Rd2#
        • 2.Rb4#
      • 1...Kxf5!
    • 1.Rd2+?
      • 1...Rc3
        • 2.Rd5#
      • 1...Rgd4
        • 2.Qg7#
        • 2.f4#
      • 1...Rcd4!
    • 1.Rb5+?
      • 1...Rcd4
        • 2.c6#
      • 1...Rgd4
        • 2.Qg7#
        • 2.f4#
      • 1...Rc3!
  • Keys
    • 1.e4!
      • threat
        • 2.Sb5#
      • 1...Rd4+
        • 2.Sc4#
      • 1...Rcxe4+
        • 2.Re2#
      • 1...Rxc5+
        • 2.Rb5#
      • 1...Kd4
        • 2.Rd2#
      • 1...Rgxe4
        • 2.Qg7#
      • 1...Rg7
        • 2.Qxg7#

This anticipates 11247(1937), 40540(1938-1939)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(b);OGATE,P_PINP(C),XP(E)::QAR2(K),XR(b)
    • R(c);N_GUARD,SBLOCK::QAB(K)
    • R(c);N_GUARD::QAB(K)
    • R(c);N_GUARD::QAB(K),XR(c)
    • B(a);OGATE,XP(C)::B(A)+R(B),DCHECK,XB(a)
  • Tries
    • Try
      • S(I);CHECK,XR(b)
      • Refutation
        • K(e);P-FLIGHT,XP(F)
    • Try
      • S(I);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(F)
    • Try
      • S(I);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(F)
    • Try
      • S(I);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(F)
    • Try
      • S(I);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(F)
    • Try
      • R(B);CHECK
      • Vars
        • R(b);P_PINP(C),P_SPINR(b)::R1(B)
      • Refutation
        • R(b);P_PINP(C),P_SPINR(b)
    • Try
      • R(B);CHECK
      • Vars
        • R(b);P_SPINR(b)::R(B)+P(E)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • P(C);
    • Threat
      • QAB(K)+S(I)
    • Vars
      • R(b);CHECK,SBLOCK::QAB(K)+S(I),DCHECK
      • R(b);CHECK,N_GUARD,XP(C)::B(A)+R(B)
      • R(b);CHECK,N_GUARD,XP(E)::B(A)+R(B)
      • K(e);S_FLIGHT::B(A)+R(B),DCHECK
      • R(c);N_GUARD,XP(C)::QAB(K)
      • R(c);N_GUARD::QAB(K),XR(c)
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