MESON Chess Problem Database

Problem Display
PID: 202332 (8/5R2/K1pN2p1/p3k3/r1rR1N2/qQp1p3/2P4B/5b1B w - - 0 1)

Mari, Alberto

2nd Prize, Il Secolo, 1923

8/5R2/K1pN2p1/p3k3/r1rR1N2/qQp1p3/2P4B/5b1B

#2

9 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Se6#
    • 1...Rb4+
      • 2.Se2#
    • 1...Rxd4+
      • 2.Sd3#
    • 1...Rc5+
      • 2.Se2#
    • 1...c5
      • 2.Rd5#
  • Tries
    • 1.Sd3+?
      • 1...Kxd4
        • 2.Be5#
        • 2.Rf4#
      • 1...Ke6!
    • 1.Sh3+?
      • 1...Ke6
        • 2.Sg5#
      • 1...Kxd4!
    • 1.Sd5+?
      • 1...Ke6
        • 2.Sc7#
        • 2.Re7#
      • 1...Kxd4!
    • 1.Sh5+?
      • 1...Ke6
        • 2.Sg7#
      • 1...Kxd4!
    • 1.Sxg6+?
      • 1...Ke6
        • 2.Sf8#
      • 1...Kxd4!
    • 1.Bd5?
      • threat
        • 2.Se2#
        • 2.Se6#
      • 1...Rcb4+
        • 2.Se2#
      • 1...Rxd4+
        • 2.Sd3#
      • 1...Rc5+
        • 2.Se2#
      • 1...Kxd6
        • 2.Sd3#
        • 2.Se6#
      • 1...cxd5
        • 2.Rxd5#
      • 1...Be2
        • 2.Sxe2#
        • 2.Se6#
      • 1...e2
        • 2.Sxe2#
        • 2.Se6#
      • 1...Kxd4!
    • 1.Rf5+?
      • 1...Kxd4
        • 2.Se6#
      • 1...gxf5!
    • 1.Re7+?
      • 1...Kxd4
        • 2.Se6#
      • 1...Kf6!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qh8#
      • 1...Rcb4+
        • 2.Sb5#
      • 1...Rxd4+
        • 2.Sc4#
      • 1...Rc5+
        • 2.Sb5#
      • 1...Kxd4
        • 2.Se6#
      • 1...Qxd6
        • 2.Qxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(h);S_FLIGHT,XR(E)::S(F)
    • R(f);CHECK::B(C)+S(F)
    • R(f);CHECK,SBLOCK,XR(E)::B(C)+S(F),DCHECK
    • P(i);N_GUARD::R1(E)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(h);P-FLIGHT,P_SPINR(f)
    • Try
      • S(F);CHECK
      • Vars
        • K(h);P-FLIGHT,P_SPINR(f)::S(F)
      • Refutation
        • K(h);S_FLIGHT,XR(E)
    • Try
      • S(F);CHECK
      • Refutation
        • K(h);S_FLIGHT,XR(E)
    • Try
      • S(F);CHECK
      • Vars
        • K(h);P-FLIGHT,P_SPINR(f)::S(F)
      • Refutation
        • K(h);S_FLIGHT,XR(E)
    • Try
      • S(F);CHECK,XP(j)
      • Vars
        • K(h);P-FLIGHT,P_SPINR(f)::S(F)
      • Refutation
        • K(h);S_FLIGHT,XR(E)
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);CHECK::B(C)+S(F)
        • R(f);CHECK,SBLOCK,XR(E)::B(C)+S(F),DCHECK
        • P(i);OGATE,XB(A)::R1(E),XP(i)
      • Refutation
        • K(h);S_FLIGHT,XR(E)
    • Try
      • R(I);CHECK
      • Vars
        • K(h);S_FLIGHT,XR(E)::S(F)
      • Refutation
        • P(j);XR(I)
    • Try
      • R(I);CHECK
      • Vars
        • K(h);S_FLIGHT,XR(E)::S(F)
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAB(D)
    • Vars
      • R(f);CHECK,S_CUTQ(b)::QAB(D)+S(H)
      • R(f);CHECK,SBLOCK,XR(E)::QAB(D)+S(H),DCHECK
      • K(h);S_FLIGHT,XR(E)::S(F)
      • Q(b);OGATE,P_SPINQ(b),XS(H)::QAB1(D),XQ(b)
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